Theta1 Crucis
The topic of Theta1 Crucis is a topic that has generated great interest and impact in society in recent years. Since its emergence, Theta1 Crucis has been the subject of debate, study and analysis in various fields, whether in politics, culture, science or technology. Theta1 Crucis has managed to capture the attention of experts and the general public, generating a wide range of opinions and positions around its meaning, implications and repercussions on society. In this article, we will thoroughly explore the impact and meaning of Theta1 Crucis in different contexts, identifying its trends and possible future projections.
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crux |
| Right ascension | 12h 03m 01.50130s[1] |
| Declination | −63° 18′ 46.5406″[1] |
| Apparent magnitude (V) | 4.30[2] |
| Characteristics | |
| Spectral type | A3(m)A8-A8[3] |
| U−B color index | +0.03[2] |
| B−V color index | +0.28[2] |
| Astrometry | |
| Radial velocity (Rv) | −2.4[4] km/s |
| Proper motion (μ) | RA: −152.35[1] mas/yr Dec.: +7.00[1] mas/yr |
| Parallax (π) | 13.88±0.15 mas[1] |
| Distance | 235 ± 3 ly (72.0 ± 0.8 pc) |
| Absolute magnitude (MV) | +1.29[5] |
| Orbit[6] | |
| Period (P) | 24.4828 d |
| Eccentricity (e) | 0.61 |
| Periastron epoch (T) | 2419453.3470 JD |
| Argument of periastron (ω) (secondary) | 358.9° |
| Semi-amplitude (K1) (primary) | 46.1 km/s |
| Semi-amplitude (K2) (secondary) | 56.1 km/s |
| Details | |
| Mass | 1.57[7] M☉ |
| Luminosity | 81[8] L☉ |
| Surface gravity (log g) | 3.76[7] cgs |
| Temperature | 7341±250[7] K |
| Age | 1.1[7] Gyr |
| Other designations | |
| θ1 Cru, CPD−62°2543, HD 104671, HIP 58758, HR 4599, SAO 251705[9] | |
| Database references | |
| SIMBAD | data |
Theta1 Crucis (θ1 Cru, Theta1 Crucis) is a spectroscopic binary star system in the southern constellation of Crux. It is visible to the naked eye with an apparent visual magnitude of 4.30m.[2] The distance to this star, as determined using parallax measurements,[1] is around 235 light years.
The pair orbit each other closely with a period of 24.5 days and an eccentricity of 0.61.[6] The primary component is an Am star, which is a chemically peculiar A-type star that shows anomalous variations in absorption lines of certain elements.[10] It has a stellar classification of A3(m)A8-A8.[3] With a mass 157% times that of the Sun,[7] it radiates 81[8] times the Sun's luminosity from its outer atmosphere at an effective temperature of 7341 K.[7] Unusually for a fully radiative A-type star, X-ray emissions have been detected, which may instead be coming from the orbiting companion.[11]
References
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ^ a b Houk, N.; Cowley, A. P. (1975), University of Michigan Catalogue of two-dimensional spectral types for the HD stars, vol. 1, Bibcode:1975mcts.book.....H.
- ^ Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C......0W.
- ^ Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
- ^ a b Pourbaix, D.; Tokovinin, A. A.; Batten, A. H.; Fekel, F. C.; Hartkopf, W. I.; et al. (2004), "SB9: The ninth catalogue of spectroscopic binary orbits", Astronomy & Astrophysics, 424 (2): 727–732, arXiv:astro-ph/0406573, Bibcode:2004A&A...424..727P, doi:10.1051/0004-6361:20041213, S2CID 119387088.
- ^ a b c d e f 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.
- ^ "tet01 Cru". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-06.
{{cite web}}: CS1 maint: postscript (link) - ^ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics, 498 (3): 961–966, Bibcode:2009A&A...498..961R, doi:10.1051/0004-6361/200810788.
- ^ 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.
