HD 40873
Star in the constellation Auriga
From Wikipedia, the free encyclopedia
HD 40873 is a star in the northern constellation of Auriga, a few degrees to the south of Delta Aurigae. Located around 411 light-years distant,[2] it shines with a luminosity approximately 45 times that of the Sun and has an effective temperature of 8,074 K.[6] It is a suspected variable star[3] and has a fairly rapid rotation rate, showing a projected rotational velocity of 134 km/s.[7] Eggen (1985) suggested it is a probable member of the Hyades Supercluster.[9]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 06h 04m 29.12056s[2] |
| Declination | +51° 34′ 24.2287″[2] |
| Apparent magnitude (V) | 6.45[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A7 V[4] or A7 III[5] |
| U−B color index | +0.16[3] |
| B−V color index | +0.196±0.007[1] |
| Astrometry | |
| Radial velocity (Rv) | 19.6±2.9[1] km/s |
| Proper motion (μ) | RA: +1.390[2] mas/yr Dec.: −44.061[2] mas/yr |
| Parallax (π) | 7.9421±0.01527 mas[2] |
| Distance | 410.7 ± 0.8 ly (125.9 ± 0.2 pc) |
| Absolute magnitude (MV) | 0.76[1] |
| Details | |
| Mass | 1.96[6] M☉ |
| Radius | 3.43[6] R☉ |
| Luminosity | 45[6] L☉ |
| Surface gravity (log g) | 3.66[6] cgs |
| Temperature | 8,074[6] K |
| Rotational velocity (v sin i) | 134[7] km/s |
| Age | 213[8] Myr |
| Other designations | |
| 35 Camelopardalis, NSV 2804, BD+51°1146, FK5 2463, HD 40873, HIP 28765, HR 2123, SAO 25548 | |
| Database references | |
| SIMBAD | data |
Samuel Molyneux named this star Telescopica in Auriga.[10] Flamsteed catalogued it as 35 Camelopardalis Heveliana, which is the name James Bradley continued to use, although it is within the borders of the modern constellation Auriga.[11] Francis Baily reclassified it to Auriga as star 1924 in the British Association's 1845 Catalogue of 8377 Stars.[12]
HD 40873 is considered to be an Am star, a chemically peculiar star with unusually strong absorption lines of metals.[13] It has been given a spectral type of kA5mA7IV,[14] although other catalogues have given more normal classifications such as A7 V or A7 III.[4][5]