Astronomy:Theta Persei
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Short description: Star system in the constellation Perseus
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h 44m 11.98704s[1] |
| Declination | +49° 13′ 42.4111″[1] |
| Apparent magnitude (V) | 4.11[2] / 9.987[3] |
| Characteristics | |
| θ Per A | |
| Evolutionary stage | Main sequence |
| Spectral type | F8 V[4] |
| U−B color index | +0.00[5] |
| B−V color index | +0.49[5] |
| θ Per B | |
| Spectral type | M1.5 V[6] |
| B−V color index | +1.48[7] |
| Astrometry | |
| Radial velocity (Rv) | +24.32[8] km/s |
| Proper motion (μ) | RA: +334.66[1] mas/yr Dec.: -89.99[1] mas/yr |
| Parallax (π) | 89.87 ± 0.22[1] mas |
| Distance | 36.29 ± 0.09 ly (11.13 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.88[9] |
| Orbit[10] | |
| Period (P) | 2,720 yr |
| Semi-major axis (a) | 22.289″ |
| Eccentricity (e) | 0.13 |
| Inclination (i) | 75.44° |
| Longitude of the node (Ω) | 128° |
| Periastron epoch (T) | B 1613 |
| Argument of periastron (ω) (secondary) | 100.64° |
| Details | |
| θ Per A | |
| Mass | 1.138±0.010[11] M☉ |
| Radius | 1.319±0.011[11] R☉ |
| Luminosity | 2.235±0.040[11] L☉ |
| Surface gravity (log g) | 4.43±0.17[12] cgs |
| Temperature | 6,328±86[12] K |
| Metallicity [Fe/H] | −0.03±0.09[12] dex |
| Age | 4.0±0.4[11] Gyr |
| θ Per B | |
| Mass | 0.521±0.052[3] M☉ |
| Radius | 0.498±0.017[3] R☉ |
| Temperature | 3,685±60[3] K |
| Metallicity [Fe/H] | −0.03±0.09[12] dex |
| Age | 2.4[3] Gyr |
| Other designations | |
| θ Per A: 13 Persei, HR 799, HD 16895, HIP 12777, FK5 93, GC 3277, PPM 45428, SAO 38288 | |
| θ Per B: 2MASS J02441025+4913540 | |
| Database references | |
| SIMBAD | θ Per |
| θ Per A | |
| θ Per B | |
Theta Persei (Theta Per, θ Persei, θ Per) is a star system 37 light years away from Earth, in the constellation Perseus. It is one of the closest naked-eye stars.
The primary star is a yellowish dwarf (main sequence) star of spectral type F8V, which is somewhat larger and brighter than the Sun, but still within the range considered to have the potential for Earth-like planets. There is also a red dwarf companion of spectral type M1.V, orbiting about 250 AU from the primary. It has a Gaia Data Release 2 parallax of 89.2871±0.1534 mas, corresponding to a distance of 11.2 pc.[13]
An 11th-magnitude star is listed in double-star catalogues as component C of the multiple system. It was 95″ away from component A in 2002,[14] although the separation is rapidly increasing as it is a distant background object with a very different proper motion to the other two stars.[15] An unconfirmed companion, possibly a brown dwarf, was reported 6.2″ from θ Persei B in 2010.[16]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics 474 (2): 653–664, doi:10.1051/0004-6361:20078357, Bibcode: 2007A&A...474..653V.
- ↑ Van Belle, Gerard T.; von Braun, Kaspar (2009). "Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars". The Astrophysical Journal 694 (2): 1085–1098. doi:10.1088/0004-637X/694/2/1085. Bibcode: 2009ApJ...694.1085V.
- ↑ 3.0 3.1 3.2 3.3 3.4 Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; von Braun, Kaspar (2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal 804 (1): 38. doi:10.1088/0004-637X/804/1/64. Bibcode: 2015ApJ...804...64M.
- ↑ Abt, H. A. (1981). "Visual multiples. VII. MK classifications". The Astrophysical Journal Supplement Series 45: 437. doi:10.1086/190719. Bibcode: 1981ApJS...45..437A.
- ↑ 5.0 5.1 Hoffleit, D.; Jaschek, C. (1991). The Bright Star Catalogue. New Haven: Yale University Observatory. Bibcode: 1991bsc..book.....H.
- ↑ Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I. et al. (2015). "CARMENES input catalogue of M dwarfs". Astronomy & Astrophysics 577: A128. doi:10.1051/0004-6361/201525803. Bibcode: 2015A&A...577A.128A. http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/12402/aa25803-15.pdf.
- ↑ Weis, Edward W. (1999). "Photometry of Late Dwarf Stars". The Astronomical Journal 117 (6): 3021–3024. doi:10.1086/300900. Bibcode: 1999AJ....117.3021W.
- ↑ Nidever, David L. et al. (August 2002), "Radial Velocities for 889 Late-Type Stars", The Astrophysical Journal Supplement Series 141 (2): 503–522, doi:10.1086/340570, Bibcode: 2002ApJS..141..503N.
- ↑ Holmberg, J. et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics 501 (3): 941–947, doi:10.1051/0004-6361/200811191, Bibcode: 2009A&A...501..941H.
- ↑ Boulé, Cory; Andrews, Kaitlyn; Penfield, Andrew; Puckette, Ian; Goodale, Keith A.; Harfenist, Steven A. (2017). "Determining Binary Star Orbits Using Kepler's Equation". Journal of Double Star Observations 13 (2): 189. Bibcode: 2017JDSO...13..189B. http://www.jdso.org/volume13/number2/Harfenist_189-199.pdf.
- ↑ 11.0 11.1 11.2 11.3 Boyajian, Tabetha S. et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal 746 (1): 101, doi:10.1088/0004-637X/746/1/101, Bibcode: 2012ApJ...746..101B. See Table 10, 12.
- ↑ 12.0 12.1 12.2 12.3 Bonfils, Xavier; Delfosse, Xavier; Udry, Stéphane; Santos, Nuno C.; Forveille, Thierry; Ségransan, Damien (2005). "Metallicity of M dwarfs. I. A photometric calibration and the impact on the mass-luminosity relation at the bottom of the main sequence". Astronomy and Astrophysics 442 (2): 635–642. doi:10.1051/0004-6361:20053046. Bibcode: 2005A&A...442..635B. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...442..635B&db_key=AST&nosetcookie=1.
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ Mason, Brian D. et al. (December 2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ Tanner, Angelle M.; Gelino, Christopher R.; Law, Nicholas M. (2010). "A High-Contrast Imaging Survey ofSIM Lite Planet Search Targets". Publications of the Astronomical Society of the Pacific 122 (896): 1195–1206. doi:10.1086/656481. Bibcode: 2010PASP..122.1195T.
External links
- "Simbad Query Result". Simbad. http://cdsweb.u-strasbg.fr/cgi-bin/bibobj?2003A%26A...400..241P&theta+Per. Retrieved March 28, 2007.
- "Draft of SIM target stars". JPL. Archived from the original on February 2, 2007. https://web.archive.org/web/20070202033143/http://astro.berkeley.edu/~gmarcy/sim_draft.html. Retrieved March 28, 2007.
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