Pi2 Columbae
The Pi2 Columbae issue is a matter of great importance that impacts the lives of millions of people around the world. This is a complex and multifaceted issue that covers a wide range of aspects, from the personal to the global level. In this article, we will explore different perspectives and approaches related to Pi2 Columbae, analyzing its relevance today and reflecting on its long-term implications. Through detailed and rigorous analysis, we will attempt to shed light on this topic and provide the reader with a deeper and more complete understanding of Pi2 Columbae.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 07m 52.86009s[1] |
| Declination | −42° 09′ 14.5488″[1] |
| Apparent magnitude (V) | 5.50[2] |
| Characteristics | |
| Spectral type | A0 V + A[3] |
| B−V color index | +0.00[2] |
| Astrometry | |
| Radial velocity (Rv) | +31.0±3.7[4] km/s |
| Proper motion (μ) | RA: −10.612[1] mas/yr Dec.: −16.928[1] mas/yr |
| Parallax (π) | 12.8296±0.1132 mas[1] |
| Distance | 254 ± 2 ly (77.9 ± 0.7 pc) |
| Absolute magnitude (MV) | +1.17[5] |
| Details[6] | |
| Mass | 2.64 M☉ |
| Luminosity | 31[7] L☉ |
| Surface gravity (log g) | 4.38±0.14 cgs |
| Temperature | 11,223±382 K |
| Rotational velocity (v sin i) | 274 km/s |
| Age | 98 Myr |
| Other designations | |
| π2 Col, CD−42°2351, HD 42303, HIP 29064, HR 2181, SAO 217730[8] | |
| Database references | |
| SIMBAD | data |
π2 Columbae, Latinized as Pi2 Columbae, is a binary star[9] system in the southern constellation of Columba, near the southern constellation border with Pictor. It is white-hued and dimly visible to the naked eye with a combined apparent visual magnitude of 5.50.[2] Based upon an annual parallax shift of 12.8 mas as seen from Earth,[1] this system is located about 254 light years from the Sun. They are receding with a heliocentric radial velocity of +31 km/s.[4]
The pair have an angular separation of 0.1[3] arc seconds with the primary being an A-type main-sequence star of spectral class A0 V,[3] while the secondary component is a similar A-type star.[9] The primary is 98 million years old with 2.6 times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 274 km/s.[6] It is radiating 31[7] times the luminosity of the Sun from its photosphere at an effective temperature of 11,223 K. The system is a source of X-ray emission with a luminosity of 184.3×1020 W, which is considered unusual since A-type stars are not expected to display magnetic activity.[3]
References
- ^ a b c d e f 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.
- ^ a b c Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
- ^ a b c d Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.
- ^ a b 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.
- ^ Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- ^ a b 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.
- ^ a b McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- ^ "pi02 Col". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-28.
{{cite web}}: CS1 maint: postscript (link) - ^ a b 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.
