 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (September 2010) |
| 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] |
| Distance | 520 ± 30 ly (159 ± 9 pc) |
| Absolute magnitude (MV) | -0.90 |
| Orbit[6] | |
| Primary | BD Cam A |
| Companion | BD 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 | |
| Radius | 135 R☉ |
| Luminosity | 185(v)/1600(bol) L☉ |
| Surface gravity (log g) | 0.9 cgs |
| Temperature | 3250 K |
| Metallicity | 0.0 |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
- ^ 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.
- ^ 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
- ^ a b c d "BD Cam". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 27 December 2016.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ Griffin, R.F. (1984). "Spectroscopic binary orbits from photoelectric radial velocities. Paper 58: HR 1105". Observatory. 104: 224–231. Bibcode:1984Obs...104..224G.
- ^ 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.