HD 34868 (HR 1758) is a solitary star located in the southern constellation Columba. With an apparent magnitude of 5.97, it's barely visible to the unaided eye. The star is located 410 light years away based on parallax, but is drifting away with a heliocentric radial velocity of 18 km/s.
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Columba |
| Right ascension | 05h 19m 23.685s[1] |
| Declination | −27° 22′ 07.98″[1] |
| Apparent magnitude (V) | 5.972±0.002[2] |
| Characteristics | |
| Spectral type | A0 V[3] or A1 IV[4] |
| B−V color index | −0.04[5] |
| Astrometry | |
| Radial velocity (Rv) | 18±4[6] km/s |
| Proper motion (μ) | RA: −3.366 mas/yr[1] Dec.: −8.459 mas/yr[1] |
| Parallax (π) | 7.9531 ± 0.0288 mas[1] |
| Distance | 410 ± 1 ly (125.7 ± 0.5 pc) |
| Absolute magnitude (MV) | +0.35[4] |
| Details | |
| Mass | 2.73±0.08[7] M☉ |
| Radius | 3.00±0.44[8] R☉ |
| Luminosity | 82.3+13 −11.3[7] L☉ |
| Surface gravity (log g) | 3.94[9] cgs |
| Temperature | 9,908±92[7] K |
| Metallicity [Fe/H] | −0.12[9] dex |
| Rotational velocity (v sin i) | 103[10] km/s |
| Age | 245±19[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Properties
editHD 34868 is an ordinary A-type main-sequence star with a mass of 2.73 solar masses, and a radius of 3 solar radii. It radiates at 82 solar luminosities from its photosphere at an effective temperature of 9,908 K, which gives it a blueish-white hue of an A0 star. HD 34868 has a rapid projected rotational velocity of 103 km/s, and is a young star, with an age of 245 million years. However, some sources give it a classification of A1 IV, which makes it a subgiant star.
References
edit- ^ a b c d 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.
- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (1 March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ Houk, N. (January 1982). Michigan Catalogue of Two-dimensional Spectral Types for the HD stars. Volume_3. Declinations -40_ƒ0 to -26_ƒ0. p. 390. Bibcode:1982mcts.book.....H.
- ^ a b Anderson, E.; Francis, Ch. (1 May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737. S2CID 119257644.
- ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
- ^ Kharchenko, N. V.; Scholz, R. -D.; Piskunov, A. E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889–896. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776. ISSN 0004-6337. S2CID 119323941.
- ^ a b c d Zorec, J.; Royer, F. (1 January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy and Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. ISSN 0004-6361. S2CID 55586789.
- ^ Stassun, Keivan G.; et al. (1 September 2018). "The TESS Input Catalog and Candidate Target List". The Astronomical Journal. 156 (3): 102. arXiv:1706.00495. Bibcode:2018AJ....156..102S. doi:10.3847/1538-3881/aad050. ISSN 0004-6256. S2CID 73582386.
- ^ a b Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
- ^ Royer, F.; Zorec, J.; Gómez, A. E. (1 February 2007). "Rotational velocities of A-type stars. III. Velocity distributions". Astronomy and Astrophysics. 463 (2): 671–682. arXiv:astro-ph/0610785. Bibcode:2007A&A...463..671R. doi:10.1051/0004-6361:20065224. ISSN 0004-6361. S2CID 18475298.