BD Camelopardalis

BD Camelopardalis

A light curve for BD Camelopardalis from Hipparcos data, adapted from Adelman (1998)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Camelopardalis
Right ascension 03h 42m 09.32470s[2]
Declination +63° 13′ 00.4977″[2]
Apparent magnitude (V) 5.11[3]
Characteristics
Spectral type S3.5/2 (M4III)[3]
U−B color index 1.82[4]
B−V color index 1.63[4]
R−I color index 1.39
Variable type Lb[5]
Astrometry
Radial velocity (Rv)-22.28[3] km/s
Proper motion (μ) RA: -17.27[2] mas/yr
Dec.: 18.94[2] mas/yr
Parallax (π)6.28 ± 0.34 mas[2]
Distance520 ± 30 ly
(159 ± 9 pc)
Absolute magnitude (MV)-0.90
Orbit[6]
PrimaryBD Cam A
CompanionBD Cam B
Period (P)596.2 days
Eccentricity (e)0.088
Inclination (i)105.6°
Longitude of the node (Ω)162.1°
Periastron epoch (T)2442794.5
Argument of periastron (ω)
(secondary)
334.3°
Details
Red giant primary
Radius135 R
Luminosity185(v)/1600(bol) L
Surface gravity (log g)0.9 cgs
Temperature3250 K
Metallicity0.0
Other designations
BD Cam, SAO 12874, BD+62° 597, HD 22649, HIP 17296, FK5 129, HR 1105[3]
Database references
SIMBADdata

BD Camelopardalis is an S star and symbiotic star in the constellation Camelopardalis. It was recognized as a spectroscopic binary star in 1922, and its orbital solution published in 1984;[7] it has a 596-day orbital period. A spectroscopic composition analysis was done of the red giant primary star in 1986.[8]

  1. ^ Adelman, S. J. (May 1998). "BVRI photometry of the extrinsic S star HR 1105". Astronomy & Astrophysics. 333: 952–955. Bibcode:1998A&A...333..952A. Retrieved 8 November 2021.
  2. ^ a b c d e van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Vizier catalog entry
  3. ^ a b c d "BD Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 27 December 2016.
  4. ^ a b van Leeuwen, F. (1970). "Photometry of high-luminosity M-type stars". Astrophysical Journal. 162: 217. Bibcode:1970ApJ...162..217L. doi:10.1086/150648.
  5. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. ^ Pourbaix, D. (2000). "Re-processing the Hipparcos Transit Data and Intermediate Astrometric Data of spectroscopic binaries. I. Ba, CH and Tc-poor S stars". Astronomy and Astrophysics Supplement. 145: 161–183. arXiv:astro-ph/0006175. Bibcode:2000A&AS..145..161P. doi:10.1051/aas:2000346. S2CID 15990458.
  7. ^ Griffin, R.F. (1984). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 58: HR 1105". Observatory. 104: 224–231. Bibcode:1984Obs...104..224G.
  8. ^ Smith, V.V.; Lambert, D.L. (1986). "The chemical composition of red giants. II - Helium burning and the s-process in the MS and S stars". Astrophysical Journal. 311: 843–863. Bibcode:1986ApJ...311..843S. doi:10.1086/164823.