HR 3082

HR 3082 is a double star in the northern circumpolar constellation of Camelopardalis. It is faintly visible to the naked eye with an apparent visual magnitude of 5.39.^[2] The system is moving closer to the Sun with a heliocentric radial velocity of +2.7 km/s.^[5] It is currently at a distance of around 341 light years, based upon an annual parallax shift of 9.57 mas.^[1]

HR 3082

Observation data Epoch J2000      Equinox J2000
Constellation	Camelopardalis
Right ascension	08h 04m 47.0589s[1]
Declination	+79° 28′ 46.610″[1]
Apparent magnitude (V)	5.39[2]
Characteristics
Spectral type	A0p Si[3] or B9.5 IVs[4]
B−V color index	−0.040±0.002[2]
Astrometry
Radial velocity (Rv)	+2.7±0.8[5] km/s
Proper motion (μ)	RA: −28.922(74) mas/yr[1] Dec.: −50.085(101) mas/yr[1]
Parallax (π)	9.5700 ± 0.0876 mas[1]
Distance	341 ± 3 ly (104.5 ± 1.0 pc)
Absolute magnitude (MV)	0.32±0.12[6]
Details
Mass	2.65±0.06[6] M☉
Radius	2.89[7] R☉
Luminosity	74+9 −8[6] L☉
Surface gravity (log g)	3.94±0.14[8] cgs
Temperature	10,795±367[8] K
Rotational velocity (v sin i)	30[8] km/s
Age	36[8] Myr
Other designations
BD+79° 265, FK5 2617, HD 64486, HIP 39538, HR 2527, SAO 6392, WDS J08048+7929AB[9]
Database references
SIMBAD	data

The brighter component is a magnetic,^[7] mild Ap star that displays an overabundance of silicon in its spectrum.^[10] Cowley et al. (1969) listed a stellar classification of A0p Si,^[3] while Abt and Morrell (1995) have it pegged as a subgiant star with a class of B9.5 IVs.^[4] It has an estimated 2.65^[6] times the mass of the Sun and 2.89^[7] times the Sun's radius. The star is radiating 74^[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,795 K.^[8]

The fainter component is a magnitude 9.6 star at an angular separation of 0.4″ along a position angle (PA) of 84°, as of 2009.^[11] This is most likely a visual companion located along the same line of sight.^[12] There is a magnitude 13.6 visual companion at a separation of 6.4″ along a PA of 169°, as of 2016.^[11]

References

1. 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.
2. 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, S2CID 119257644.
3. 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
4. Abt, Helmut A.; Morrell, Nidia I. (July 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.
5. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
6. Kochukhov, O.; Bagnulo, S. (2006), "Evolutionary state of magnetic chemically peculiar stars", Astronomy and Astrophysics, 450 (2): 763, arXiv:astro-ph/0601461, Bibcode:2006A&A...450..763K, doi:10.1051/0004-6361:20054596, S2CID 18596834.
7. Shulyak, D.; et al. (September 2014), "Interferometry of chemically peculiar stars: theoretical predictions versus modern observing facilities", Monthly Notices of the Royal Astronomical Society, 443 (2): 1629–1642, arXiv:1406.6093, Bibcode:2014MNRAS.443.1629S, doi:10.1093/mnras/stu1259.
8. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
9. "HD 49878". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-06-06.
10. Adelman, S. J. (September 1982), "Spectrophotometry of peculiar B and A stars. XII - HD 10783, 56 Tauri, HD 43819, 53 Aurigae, 49 Camelopardalis, HD 64486, HD 147550, HD 184905 and HD 192913", Astronomy and Astrophysics Supplement Series, 49: 663–672, Bibcode:1982A&AS...49..663A.
11. Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
12. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.