// Workers AI · dad joke modeWhat did HD 40873 say to its star friend? You're a big number to me.
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| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| 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 |
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]
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]
Components
[edit]HD 40873 has a 9th magnitude class A5 companion about half an arc-minute away. It is designated as SAO 25549.[15] The companion is itself a pair of stars, each of similar brightness, separated by 0.6".[16]
References
[edit]- 1 2 3 4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 3 Danziger, I. J.; Dickens, R. J. (July 1967). "Spectrophotometry of New Short-Period Variable Stars". Astrophysical Journal. 149: 55. Bibcode:1967ApJ...149...55D. doi:10.1086/149231.
- 1 2 Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- 1 2 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 3 4 5 6 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
- 1 2 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 (3): 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. S2CID 14070763.
- ↑ Kounkel, Marina; Stassun, Keivan G.; Bouma, Luke G.; Covey, Kevin; Hillenbrand, Lynne A.; Curtis, Jason Lee (2022). "Untangling the Galaxy. IV. Empirical Constraints on Angular Momentum Evolution and Gyrochronology for Young Stars in the Field". The Astronomical Journal. 164 (4): 137. arXiv:2206.13545. Bibcode:2022AJ....164..137K. doi:10.3847/1538-3881/ac866d.
- ↑ Eggen, O. J. (June 1985). "A systematic search for members of the Hyades Supercluster. IV - The metallic-line stars and ultrashort-period Cepheids". Astronomical Journal. 90: 1046−1059. Bibcode:1985AJ.....90.1046E. doi:10.1086/113812.
- ↑ Bradley, James; Rigaud, Stephen Peter (1832). Miscellaneous works and correspondence of the Rev. James Bradley, D.D., F.R.S. Oxford University Press. p. 212.
- ↑ Wagman, M. (1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy. 18 (3): 209–223. Bibcode:1987JHA....18..209W. doi:10.1177/002182868701800305. S2CID 118445625.
- ↑ British Association for the Advancement of Science; Francis Baily (1845). The Catalogue of Stars of the British Association for the Advancement of Science: Containing the Mean Right Ascensions and North Polar Distances of Eight Thousand Three Hundred and Seventy-seven Fixed Stars, Reduced to January 1, 1850: Together with Their Annual Precessions, Secular Variations and Proper Motions, as Well as the Logarithmic Constants for Computing Precession, Aberration and Nutation. With a Preface Explanatory of Their Construction and Application. R. and J. E. Taylor. pp. 2–.
- ↑ Renson, P.; Manfroid, J. (2009). "Catalogue of Ap, HGMN and Am stars". Astronomy and Astrophysics. 498 (3): 961. Bibcode:2009A&A...498..961R. doi:10.1051/0004-6361/200810788.
- ↑ Gray, R. O.; Garrison, R. F. (1989). "The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". The Astrophysical Journal Supplement Series. 70: 623. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.
- ↑ "CCDM J06045+5135BC". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 February 2018.
- ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
