Pi1 Columbae
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba[1] |
| Right ascension | 06h 06m 41.03304s[2] |
| Declination | −42° 17′ 55.585″[2] |
| Apparent magnitude (V) | 6.13[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | A2mA5-A9[5] |
| U−B color index | +0.11[3] |
| B−V color index | +0.25[3] |
| Astrometry | |
| Radial velocity (Rv) | 6.56±0.78[4] km/s |
| Proper motion (μ) | RA: −26.957 mas/yr[2] Dec.: −5.880 mas/yr[2] |
| Parallax (π) | 11.6365±0.1653 mas[2] |
| Distance | 280 ± 4 ly (86 ± 1 pc) |
| Absolute magnitude (MV) | +1.55[1] |
| Details | |
| Mass | 1.75[6] M☉ |
| Radius | 2.49+0.15 −0.11[2] R☉ |
| Luminosity | 20.237+0.23 −0.33[2] L☉ |
| Surface gravity (log g) | 3.85[6] cgs |
| Temperature | 7,765+171 −228[2] K |
| Rotational velocity (v sin i) | 70[7] km/s |
| Age | 1.1[8] Gyr |
| Other designations | |
| π1 Col, CPD−42°2343, GC 7785, HD 42078, HIP 28957, HR 2171, SAO 217720[9] | |
| Database references | |
| SIMBAD | data |
Pi1 Columbae is a star in the southern constellation of Columba. Its name is a Bayer designation that is Latinized from π1 Columbae, and abbreviated Pi1 Col or π1 Col. With an apparent visual magnitude of 6.13,[3] it is a dim, white-hued star that is near the limit of visibility for the naked eye. It is located at a distance of approximately 280 light-years (86 pc) from the Sun based on parallax,[2] and has an absolute magnitude of +1.55.[1]
This is an Am star with a stellar classification of A2mA5-A9,[5] which means it is a chemically peculiar star that displays strong absorption lines of higher mass elements in its spectrum. At an estimated age of 1.1[8] billion years, this star is spinning with a projected rotational velocity of 70 km/s.[7] It has 1.75[6] times the mass of the Sun and 2.5 times the Sun's radius. The star is radiating 20 times the luminosity of the Sun from its photosphere at an effective temperature of 7,765 K.[2]
A 2024 study of stellar pulsation in Am and Fm stars suggested that π1 Col is a Gamma Doradus variable.[10]
References
[edit]- 1 2 3 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 8 9 10 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018), "Gaia Data Release 2: Summary of the contents and survey properties", Astronomy & Astrophysics, 616, A1, arXiv:1804.09365, Bibcode:2018A&A...616A...1G, doi:10.1051/0004-6361/201833051 Gaia DR2 record for this source at VizieR.
- 1 2 3 4 Feinstein, A. (1974), "Photoelectric UBVRI observations of AM stars", Astronomical Journal, 79: 1290, Bibcode:1974AJ.....79.1290F, doi:10.1086/111675.
- 1 2 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 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
- 1 2 3 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 Levato, O. H. (August 1972), "Rotational Velocities and Spectral Types of Some A-Type Stars", Publications of the Astronomical Society of the Pacific, 84 (500): 584, Bibcode:1972PASP...84..584L, doi:10.1086/129336
- 1 2 Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031.
- ↑ "pi01 Col". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.
- ↑ Dürfeldt-Pedros, O.; et al. (October 2024), "Variability and stellar pulsation incidence in Am and Fm stars using TESS and Gaia data", Astronomy & Astrophysics, 690, id. A104, arXiv:2408.11657, Bibcode:2024A&A...690A.104D, doi:10.1051/0004-6361/202349076.
