Archive for the ‘B Stars’ Category

Achernar in HAlpha

Posted by Paulo Cacella on 11th February 2016 in B Stars, Recent Posts, Spectroscopy
This is achernar in halpha. Obtained at 10 feb 2016 20:26GMT. LHIRES 1200lpm 19u slit ZWO174MM

achernar

Achernar HAlpha 28 Dec 2014

Posted by Paulo Cacella on 28th December 2014 in B Stars, Recent Posts, Spectroscopy
achernar profile vspec 28dec14

Zeta Puppis Spectrum HEII 4686A

Posted by Paulo Cacella on 27th December 2014 in B Stars, Recent Posts, Spectroscopy
This was obtained with MAG telescope (50cm) and LHIRESIII at 2400lpm 35u slit. Exposure was 7 x 10 minutes. Frequencies are only an approximation as I´ve not used any reference frame for calibration.



zetapup.bass

Achernar in HAlpha

Posted by Paulo Cacella on 25th December 2014 in B Stars, Recent Posts, Spectroscopy
This is a spectrum obtained with MAG 50cm telescope, LHIRESIII 2400, ST8NABG, 600 sec exposure

achernar halpha 600s
Doppler
achernar halpha 600s doppler

Achernar and Acamar at HBeta

Posted by Paulo Cacella on 20th October 2014 in B Stars, Recent Posts, Spectroscopy
acamar e achernar ii

Rho Ophiuchi spectrum B2v

Posted by Paulo Cacella on 30th August 2010 in B Stars, B Stars, Spectroscopy, Stars
Rho Ophiuchi is a 4.6 mag star in a complex region with a B2v spectrum / / / /We obtained a detailed Rho Ophiuchi spectrum with a 300s exposure in a C14/F11/ G11 mount guided with external SBIG head and a DSS-7 spectroscope. / / / /Below we have the synthetic spectrum / / / / / / / /Below we can see the general spectrum with our spectrum not removing the telluric lines in green. In purple we see the reference star. / / / / / /
Here the detail of Balmer Lines and interstellar K1 line at 4044A.
/ /
/ /
And here a detail of Paschen Lines in the infrared. We can see that spectrum is usable over 10k A.
/ /
/ /
Comments from the Hipparcos Catalog:
/ /
Hipparcos #80473
/ /
Click here for SIMBAD data
/ /
RA (J2000.0): 16 25 35.12
/ /
declination -23 26 49.6
/ /
(Above is the computed position for J1991.25)
/ /
magnitude in Johnson V: 4.57
/ /
Magnitude derived from ground-based observations
/ /
Trigonometric parallax 8.27 ± 1.18 milliarcseconds
/ /
Proper motion in RA: -5.61 ± 1.05 milliarcseconds/year
/ /
Proper motion in dec: -25.04 ± 0.93 milliarcseconds/year
/ /
Mean BT magnitude: 5.212 ± 0.009
/ /
Mean VT magnitude: 5.002 ± 0.010
/ /
Johnson B-V colour: 0.227 ± 0.022
/ /
Johnson B-V source is ground-based observations
/ /
Color index (V-I) in Cousins’ system: 0.25 ± 0.03
/ /
Median magnitude in Hipparcos system (Hpmag): 4.6152 ± 0.0006
/ /
Scatter on Hpmag is 0.005 magnitudes
/ /
Hpmag is based on 79 observations
/ /
Hpmag is based on the combined magnitude of a double system,
/ /
corrected for attenuation
/ /
Hpmag at maximum (5th percentile): 4.60
/ /
Hpmag at minimum (95th percentile): 4.63
/ /
Duplicity-induced variability
/ /
This system had been previously identified as multiple in
/ /
the Hipparcos Input Catalog
/ /
CD -23 12861
/ /
Spectral type B2V
/ /
Spectral type is from Michigan HD stars, vol. 4 (Houk+, 1988)
/ /
Data inferred from the Hipparcos catalog:
/ /
Distance: 121 ± 17 parsecs (394 ± 56 light-years)
/ /
Luminosity: 181 ± 52 times that of the sun
/ /
Absolute magnitude: -0.84 ± 0.31
/ /
J2000 position at current date (proper motion included):
/ /
Right ascension: 16h25m35.1132s
/ /
Declination: -23 26′ 50.110″
/ /
(Above is ±20.4 milliarcseconds in RA, ±18.1 milliarcseconds in dec)
/ /
J2000 position at current date (proper motion and parallax included):
/ /
Right ascension: 16h25m35.1126s
/ /
Declination: -23 26′ 50.108″
/ /
Data from the Tycho catalog:
/ /
TYC 6794 549
/ /
Johnson V magnitude: 5.049 ± 0.018
/ /
J2000 position at current date (proper motion included):
/ /
Right ascension: 16h25m35.1695s
/ /
Declination: -23 26′ 50.247″
/ /
(Above is ±78.7 milliarcseconds in RA, ±78.7 milliarcseconds in dec)
/ /
J2000 position at current date (proper motion and parallax included):
/ /
Right ascension: 16h25m35.1689s
/ /
Declination: -23 26′ 50.245″
/ /
Proper motion in RA: 35 ± 4 milliarcseconds/year
/ /
Proper motion in dec: -31 ± 4 milliarcseconds/year
/ /
Parallax 8 ± 1 milliarcseconds
/ /
BT magnitude 5.258 +/- 0.014
/ /
VT magnitude 5.067 +/- 0.009
/ /
Data inferred from the Tycho catalog:
/ /
Johnson B-V color, computed from BT and VT: 0.172 +/- 0.014
/ /
Distance: 125 ± 16 parsecs (408 ± 51 light-years)
/ /
Luminosity: 124 ± 31 times that of the sun
/ /
Absolute magnitude: -0.44 ± 0.27
/ /
Comments from the GSC:
/ /
GSC identifier 6794 549
/ /
RA            declination    posn err  magnitude    type
/ /
Exposure start      Exp. Length   Obs. ID     Filter
/ /
16h25m35.150s -23 26′ 49.81″   0.1″     3.78±0.00  star
/ /
(Data comes from Tycho Input Catalog)
/ /
Comments from the PPM catalog:
/ /
PPM 265516
/ /
Magnitude: 5.2
/ /
J2000 RA: 16h 25m 35.101s
/ /
J2000 dec: -23 26′ 48.70″
/ /
Proper motion in RA: -0.0007 RA seconds/year
/ /
Proper motion in dec: -0.019 arcseconds/year
/ /
J2000 position at epoch:
/ /
Right ascension: 16h25m35.093s
/ /
Declination: -23 26′ 48.90″
/ /
Mean position at current epoch:
/ /
Right ascension: 16h26m13.541s
/ /
Declination: -23 28′ 14.17″
/ /
Apparent position at current epoch:
/ /
Right ascension: 16h26m14.795s
/ /
Declination: -23 28′ 19.36″
/ /
(Above is ±207.4 milliarcseconds in RA, ±200.3 milliarcseconds in dec)
/ /
Spectral type B5
/ /
CD -23 12861A
/ /
Double star.  Don’t use as a positional reference.
/ /
Comments from the SAO catalog:
/ /
SAO 184382
/ /
Magnitude: 5.22
/ /
Spectral type B5
/ /
DM -23 12861
/ /
Right ascension: 16h25m35.093s
/ /
Declination: -23 26′ 49.59″
/ /
Proper motion in RA: +0.002 arcseconds/year
/ /
Proper motion in dec: -0.020 arcseconds/year
/ /
Proper motion total: 0.020 arcseconds/year
/ /
Comments from the HD catalog:
/ /
HD 147933
/ /
CD -2312861 A
/ /
Visual magnitude  5.22
/ /
Photographic magnitude  5.10
/ /
Spectral type B5
/ /
Comments from the MHD catalog:
/ /
Spectral type B2/3 V
/ /
HR 6112; *RHO OPH; UNDETECTED VISUAL DOUBLE AB
/ /
|P=344 *DG |D=3.1 *ARCSC MAGS 5.2, 5.9; AC |D=51.
/ /
*ARCSC MAGS 5.2, 7.8; AD |P=253 *DG |D=56. *ARCSC
/ /
MAGS 5.2, 6.9; DE |P=358 *DG |D=0.6 *ARCSC MAGS
/ /
6.9, 8.1; COMPONENT WITH HD 147888, 147932,
/ /
147934
/ /
Comments from the Bright Star catalog:
/ /
Magnitude: 5.02
/ /
Right ascension: 16h25m35.100s
/ /
Declination: -23 26′ 50.00″
/ /
Proper motion in RA: +0.003 arcseconds/year
/ /
Proper motion in dec: -0.021 arcseconds/year
/ /
Proper motion total: 0.021 arcseconds/year
/ /
CD -23 12861
/ /
HR (Bright Star) catalog spectrum:   B2IV
/ /
HR #6112   SAO #184382   HD #147933
/ /
parallax D+013
/ /
Double/Multiple
/ /
Binary with HR 6113, combined colors.  Combined
/ /
mag. 4.63V.  Component C, CoD-23d12862, 7.13v, B9n,
/ /
152″ CPM, v sin i 180k/s; D, 6.56 B3V at 156″, v
/ /
sin i 167k/s.  E, 8.1v, 0.6″ from D.  DE is ADS
/ /
10045.
/ /
Group Membership
/ /
Sco OB2; upper Sco region; in reflection nebula;
/ /
assoc. Sco R1; IC 4604.
/ /
Radial and/or Rotational Velocity
/ /
Rapidly rotating star, candidate for becoming a Be
/ /
star.
/ /
Spectrum
/ /
Sp. shows interstellar K1 line at 4044A.
/ /
Interstellar SO emission features.
/ /Comments from the Hipparcos Catalog: / /Hipparcos #80473Click here for SIMBAD dataRA (J2000.0): 16 25 35.12declination -23 26 49.6(Above is the computed position for J1991.25)magnitude in Johnson V: 4.57Magnitude derived from ground-based observationsTrigonometric parallax 8.27 ± 1.18 milliarcsecondsProper motion in RA: -5.61 ± 1.05 milliarcseconds/yearProper motion in dec: -25.04 ± 0.93 milliarcseconds/yearMean BT magnitude: 5.212 ± 0.009Mean VT magnitude: 5.002 ± 0.010Johnson B-V colour: 0.227 ± 0.022Johnson B-V source is ground-based observationsColor index (V-I) in Cousins’ system: 0.25 ± 0.03Median magnitude in Hipparcos system (Hpmag): 4.6152 ± 0.0006Scatter on Hpmag is 0.005 magnitudesHpmag is based on 79 observationsHpmag is based on the combined magnitude of a double system,corrected for attenuationHpmag at maximum (5th percentile): 4.60Hpmag at minimum (95th percentile): 4.63Duplicity-induced variabilityThis system had been previously identified as multiple inthe Hipparcos Input CatalogCD -23 12861Spectral type B2VSpectral type is from Michigan HD stars, vol. 4 (Houk+, 1988) / /Data inferred from the Hipparcos catalog: / /Distance: 121 ± 17 parsecs (394 ± 56 light-years)Luminosity: 181 ± 52 times that of the sunAbsolute magnitude: -0.84 ± 0.31 / /J2000 position at current date (proper motion included):Right ascension: 16h25m35.1132sDeclination: -23 26′ 50.110″(Above is ±20.4 milliarcseconds in RA, ±18.1 milliarcseconds in dec)J2000 position at current date (proper motion and parallax included):Right ascension: 16h25m35.1126sDeclination: -23 26′ 50.108″ / /Data from the Tycho catalog: / /TYC 6794 549Johnson V magnitude: 5.049 ± 0.018J2000 position at current date (proper motion included):Right ascension: 16h25m35.1695sDeclination: -23 26′ 50.247″(Above is ±78.7 milliarcseconds in RA, ±78.7 milliarcseconds in dec)J2000 position at current date (proper motion and parallax included):Right ascension: 16h25m35.1689sDeclination: -23 26′ 50.245″Proper motion in RA: 35 ± 4 milliarcseconds/yearProper motion in dec: -31 ± 4 milliarcseconds/yearParallax 8 ± 1 milliarcsecondsBT magnitude 5.258 +/- 0.014VT magnitude 5.067 +/- 0.009 / /Data inferred from the Tycho catalog: / /Johnson B-V color, computed from BT and VT: 0.172 +/- 0.014Distance: 125 ± 16 parsecs (408 ± 51 light-years)Luminosity: 124 ± 31 times that of the sunAbsolute magnitude: -0.44 ± 0.27 / /Comments from the GSC: / /GSC identifier 6794 549RA            declination    posn err  magnitude    typeExposure start      Exp. Length   Obs. ID     Filter / /16h25m35.150s -23 26′ 49.81″   0.1″     3.78±0.00  star(Data comes from Tycho Input Catalog) / / / /Comments from the PPM catalog: / /PPM 265516Magnitude: 5.2J2000 RA: 16h 25m 35.101sJ2000 dec: -23 26′ 48.70″Proper motion in RA: -0.0007 RA seconds/yearProper motion in dec: -0.019 arcseconds/yearJ2000 position at epoch:Right ascension: 16h25m35.093sDeclination: -23 26′ 48.90″Mean position at current epoch:Right ascension: 16h26m13.541sDeclination: -23 28′ 14.17″Apparent position at current epoch:Right ascension: 16h26m14.795sDeclination: -23 28′ 19.36″(Above is ±207.4 milliarcseconds in RA, ±200.3 milliarcseconds in dec)Spectral type B5CD -23 12861A   Double star.  Don’t use as a positional reference. / /Comments from the SAO catalog: / /SAO 184382Magnitude: 5.22Spectral type B5DM -23 12861Right ascension: 16h25m35.093sDeclination: -23 26′ 49.59″Proper motion in RA: +0.002 arcseconds/yearProper motion in dec: -0.020 arcseconds/yearProper motion total: 0.020 arcseconds/year / /Comments from the HD catalog: / /HD 147933CD -2312861 AVisual magnitude  5.22Photographic magnitude  5.10Spectral type B5 / /Comments from the MHD catalog: / /Spectral type B2/3 VHR 6112; *RHO OPH; UNDETECTED VISUAL DOUBLE AB|P=344 *DG |D=3.1 *ARCSC MAGS 5.2, 5.9; AC |D=51.*ARCSC MAGS 5.2, 7.8; AD |P=253 *DG |D=56. *ARCSCMAGS 5.2, 6.9; DE |P=358 *DG |D=0.6 *ARCSC MAGS6.9, 8.1; COMPONENT WITH HD 147888, 147932,147934 / /Comments from the Bright Star catalog: / /Magnitude: 5.02Right ascension: 16h25m35.100sDeclination: -23 26′ 50.00″Proper motion in RA: +0.003 arcseconds/yearProper motion in dec: -0.021 arcseconds/yearProper motion total: 0.021 arcseconds/yearCD -23 12861HR (Bright Star) catalog spectrum:   B2IVHR #6112   SAO #184382   HD #147933parallax D+013 / /Double/Multiple   Binary with HR 6113, combined colors.  Combinedmag. 4.63V.  Component C, CoD-23d12862, 7.13v, B9n,152″ CPM, v sin i 180k/s; D, 6.56 B3V at 156″, vsin i 167k/s.  E, 8.1v, 0.6″ from D.  DE is ADS10045.Group Membership   Sco OB2; upper Sco region; in reflection nebula;assoc. Sco R1; IC 4604.Radial and/or Rotational Velocity   Rapidly rotating star, candidate for becoming a Bestar.Spectrum   Sp. shows interstellar K1 line at 4044A.Interstellar SO emission features. / / / /The Rho Ophiuchi cloud complex is a dark nebula of gas and dust that is located 1° south of the star ? Ophiuchiof the constellation Ophiuchus. At an estimated distance of 131 ± 3 parsecs,[5][3] this cloud is one of the closeststar-forming regions to the Solar System.[1] / / / /This cloud covers an angular area of 4.5° × 6.5° on the celestial sphere. It consists of two major regions of dense gas and dust. The first contains a star-forming cloud (L1688) and two filaments (L1709 and L1755), while the second has a star-forming region (L1689) and a filament (L1712–L1729). These filaments extend up to 10–17.5 parsecs in length and can be as narrow as 0.24 parsecs in width. Some of the structures within the complex appear to be the result of a shock front passing through the clouds from the direction of the neighboring Sco OB2 association.[4] / / / /Temperatures of the clouds range from 13–22 K, and there is a total of about 3,000 times the mass of the Sun in material. Over half of the mass of the complex is concentrated around the L1688 cloud, and this is the most active star-forming region.[4] There are embedded infrared sources within the complex.[6] A total of 425 infrared sources have been detected near the L1688 cloud. These are presumed to be young stellar objects, including 16 classified as protostars, 123 T Tauri stars with dense circumstellar disks, and 77 weaker T Tauri stars with thinner disks.[3]The last two categories of stars have estimated ages ranging from 100,000 to a million years.[7] / / / /The first brown dwarf to be identified in a star-forming region was Rho Oph J162349.8-242601, located in the Rho Ophiuchi cloud.[8] One of the older objects at the edge of the primary star-forming region was found to be a circumstellar disk seen nearly edge on. It spans a diameter of 300 AU and contains at least twice the mass of Jupiter. The million-year-old star at the center of the disk has a temperature of 3,000 K and is emitting 0.4 times theluminosity of the Sun.[9]

Delta Scorpii, a Be star

Posted by Paulo Cacella on 22nd August 2010 in B Stars, B Stars, Spectroscopy, Stars
Beta Scorpii is a B0.2 IV star, variable type Gamma Cassiopeiae, that recently had brightened. Below we can see a full spectrum, 90 seconds, DSS-7, resolution around 15A, with scale of 5.428A/pixel. In green we see my spectrum and in purple the reference star spectrum type B0v Then we can see details in H-Alpha and H-Beta/Gamma sectors The id below is HGamma and not HBeta /

Al Nair (Alpha Gruis) B7IV Spectrum

Posted by Paulo Cacella on 15th August 2010 in B Stars, B Stars, Spectroscopy, Stars
We got a spectra of Alpha Gruis, a light blue star in southern skies with magnitude 1.7 / / / /This is the synthetic spectrum through the CCD / / / / / / / /Here you can see in the green color the spectrum obtained and in yellow a reference for a star  B6IV. We can see the Balmer Hydrogen lines easily / / / / / / / /Below we can see the standard for an A star to identify the spectral lines / / / /