HD 49976
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 06h 50m 42.30364s[1] |
| Declination | –08° 02′ 27.5937″[1] |
| Apparent magnitude (V) | 6.306 |
| Characteristics | |
| Spectral type | A2P SR CR EU[2] |
| U−B color index | +0.02[3] |
| B−V color index | +0.00[3] |
| Variable type | α2 CVn |
| Astrometry | |
| Radial velocity (Rv) | 22.4[4] km/s |
| Proper motion (μ) | RA: –8.68[1] mas/yr Dec.: +2.07[1] mas/yr |
| Parallax (π) | 10.01 ± 0.40[1] mas |
| Distance | 330 ± 10 ly (100 ± 4 pc) |
| Absolute magnitude (MV) | +1.13[5] |
| Details | |
| Mass | 2.21±0.11[5] M☉ |
| Radius | 2.3±0.3[5] R☉ |
| Luminosity | 32[5] L☉ |
| Surface gravity (log g) | 4.04±0.13[5] cgs |
| Temperature | 9,016[5] K |
| Rotation | 2.976 days[5] |
| Rotational velocity (v sin i) | 31[6] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 49976, also known as V592 Monocerotis, is a variable star in the constellation of Monoceros (the Unicorn). It is a chemically peculiar star showing excesses in strontium and the rare earth elements in the photosphere, among others. The magnetic field is complex; not corresponding to a simple dipole.[7]
References
- 1 2 3 4 5 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357
- ↑ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819
- 1 2 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99), Bibcode:1966CoLPL...4...99J
- ↑ Babcock, Horace W. (January 1958), "A Catalog of Magnetic Stars.", Astrophysical Journal Supplement 3: 141, Bibcode:1958ApJS....3..141B, doi:10.1086/190035
- 1 2 3 4 5 6 7 North, P. (June 1998), "Do SI stars undergo any rotational braking?", Astronomy and Astrophysics 334: 181–187, arXiv:astro-ph/9802286, Bibcode:1998A&A...334..181N
- ↑ Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics 393: 897−911, arXiv:astro-ph/0205255, Bibcode:2002A&A...393..897R, doi:10.1051/0004-6361:20020943
- ↑ Glagolevskij, Yu. V.; et al. (October 2013), "Features of calcium and strontium distribution on the surface of CP star HD49976", Astrophysical Bulletin 68 (4): 454−460, Bibcode:2013AstBu..68..454G, doi:10.1134/S1990341313040068
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