BD Camelopardalis
File:BDCamLightCurve.png A light curve for BD Camelopardalis from Hipparcos data, adapted from Adelman (1998)[1] | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.11[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | S3.5/2[5] (M4III)[6] |
| U−B Template:Engvar | 1.82[7] |
| B−V Template:Engvar | 1.63[7] |
| R−I Template:Engvar | 1.39 |
| Variable type | Lb[8] |
| Astrometry | |
| Radial velocity (Rv) | −22.28[9] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: +20.052 mas/yr[2] |
| Parallax (π) | 4.2671±0.2581 mas[2] |
| Distance | Script error: No such module "val". ly (Script error: No such module "val". pc)[10] |
| Absolute magnitude (MV) | −0.90 |
| Orbit[11] | |
| 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 | |
| Mass | 2.68[12] Template:Solar mass |
| Radius | Script error: No such module "val".[13] Template:Solar radius |
| Luminosity | 2,000[14] Template:Solar luminosity |
| Surface gravity (log g) | 1.5[12] cgs |
| Temperature | Script error: No such module "val".[14] K |
| Metallicity | Script error: No such module "val".[12] |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| BD Cam, SAO 12874, BD+62°597, HD 22649, HIP 17296, FK5 129, HR 1105[15] | |
| Database references | |
| SIMBAD | data |
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BD Camelopardalis is an S star and symbiotic star in the constellation Camelopardalis. It is a 5th magnitude star, and is visible to the naked eye under good observing conditions. It was recognized as a spectroscopic binary star in 1922, and its orbital solution published in 1984;[16] it has a 596-day orbital period. A spectroscopic composition analysis was done of the red giant primary star in 1986.[17]
Description
Although the star's spectrum shows the spectral features of zirconium oxide which define spectral class S, BD Cam shows no technetium lines in its spectrum. It is believed to be an "extrinsic" S star, one whose s-process element excesses originate in a binary companion star.
In 1928, Joel Stebbins and Charles Morse Huffer announced that the star, then called HR 1105, is a variable star, based on observations made at Washburn Observatory.[18] It was given its variable star designation, BD Camelopardalis, in 1977.[19] The system displays only minimal variations in the visible, but the presence of the companion and its interactions with the stellar wind of the visible red giant makes for easily observed time-variable spectral features in the ultraviolet and in the near infrared spectral line of helium.
At times BD Cam is the brightest S star in the visible sky, because other bright S stars are Mira variables or other types of variable star with large changes in apparent brightness. Its own brightness variability in the visible part of the spectrum is modest.
References
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- ↑ Script error: No such module "Citation/CS1". Data about this star can be seen here.
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- ↑ a b Script error: No such module "Citation/CS1". BD Cam's database entry at VizieR.
- ↑ Template:Cite simbad
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Further reading
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- HR 1105
- Image BD Camelopardalis
- Symbiotic Star Blows Bubbles Into Space