Summary
HR 3803 or N Velorum (N Vel) is a 3rd-magnitude star on the border between the southern constellations Carina and Vela. Based upon parallax measurements, it is approximately 239 light-years (73 parsecs) from Earth. It is an orange-hued K-type giant star and has twice the mass of the Sun.[5] The measured angular diameter of this star, after correction for limb darkening, is 7.13 ± 0.08 mas.[7] At the estimated distance of HR 3803,[1] this yields a physical size of about 29 times the radius of the Sun.[6]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela |
| Right ascension | 09h 31m 13.31891s[1] |
| Declination | –57° 02′ 03.7578″[1] |
| Apparent magnitude (V) | 3.16[2] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.88[4] |
| B−V color index | +1.55[4] |
| Astrometry | |
| Radial velocity (Rv) | –13.9[2] km/s |
| Proper motion (μ) | RA: –32.54[1] mas/yr Dec.: +5.87[1] mas/yr |
| Parallax (π) | 13.65 ± 0.10 mas[1] |
| Distance | 239 ± 2 ly (73.3 ± 0.5 pc) |
| Details | |
| Mass | 2.0[5] M☉ |
| Radius | 29[6] R☉ |
| Temperature | 3,860[5] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
In 1752, French astronomer Nicolas Louis de Lacaille divided the former constellation Argo Navis into three separate constellations, and then referenced its stars by extending Bayer's system of star nomenclature;[8] this star was given the designation N Velorum. In 1871 Benjamin Apthorp Gould discovered this star to be variable, but this occurred prior to the standardization of variable star nomenclature by German astronomer Friedrich Wilhelm Argelander during the nineteenth century, so it does not fall into the standard range of variable star designations.[9]
References edit
- ^ a b c d e f van Leeuwen, F. (November 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, S2CID 18759600
- ^ a b Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astron. Rechen-Inst. Heidelb, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W
- ^ Morgan, W. W.; Keenan, P. C. (1973). "Spectral Classification". Annual Review of Astronomy and Astrophysics. 11 (1): 29. Bibcode:1973ARA&A..11...29M. doi:10.1146/annurev.aa.11.090173.000333.
- ^ a b Johnson, H. L.; et al. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99): 99. Bibcode:1966CoLPL...4...99J.
- ^ a b c Gondoin, P. (December 1999), "Evolution of X-ray activity and rotation on G-K giants", Astronomy and Astrophysics, 352: 217–227, Bibcode:1999A&A...352..217G
- ^ a b Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, vol. 1 (3 ed.), Birkhäuser, ISBN 3540296921. The radius (R*) is given by:
- ^ Richichi, A.; Percheron, I.; Khristoforova, M. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039
- ^ "Greek Letter Designations Southern Stars". Archived from the original on 2010-01-21. Retrieved 2012-04-13.
- ^ Hoffleit, Dorrit (December 1987), "History of Variable Star Nomenclature" (PDF), The Journal of the American Association of Variable Star Observers, 16 (2): 65–70, Bibcode:1987JAVSO..16...65H, retrieved 2012-02-02
