astro.wikisort.org - StarHD 89744 is a star in the northern circumpolar constellation of Ursa Major, positioned about 0.4° due south of the bright star Tania Australis (μ UMa).[11] This object has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.73.[2] The distance to this star has been measured using the patallax method, which locates it 126 light years from the Sun. It is drifting closer with a radial velocity of −4.4 km/s.[2] There are two known exoplanets orbiting this star.
F-type main sequence star in the constellation Ursa Major
HD 89744
Observation data Epoch J2000.0 Equinox J2000.0 |
Constellation |
Ursa Major |
Right ascension |
10h 22m 10.5623s[1] |
Declination |
+41° 13′ 46.3088″[1] |
Apparent magnitude (V) |
5.73[2] |
Characteristics |
Evolutionary stage |
Main sequence |
Spectral type |
F7V[3] or F8IV[4] |
B−V color index |
0.531±0.003[2] |
Astrometry |
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|
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Radial velocity (Rv) | −4.35±0.12[2] km/s |
Proper motion (μ) | RA: −120.573±0.111[1] mas/yr Dec.: −138.144±0.131[1] mas/yr |
Parallax (π) | 25.8537 ± 0.0716 mas[1] |
Distance | 126.2 ± 0.3 ly (38.7 ± 0.1 pc) |
Absolute magnitude (MV) | 2.83[5] |
|
Details |
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A |
---|
Mass | 1.37±0.09[6] M☉ |
Radius | 2.16+0.06 −0.01[1] R☉ |
Luminosity | 6.38±0.02[7] L☉ |
Surface gravity (log g) | 4.27±0.05[6] cgs |
Temperature | 6,381±43[6] K |
Metallicity [Fe/H] | 0.30±0.03[6] dex |
Rotation | ~9 days[7] |
Rotational velocity (v sin i) | 9.3[8] km/s |
Age | 8.4[7] Gyr |
B |
---|
Mass | 0.076[9] M☉ |
Other designations |
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BD+41°2076, GJ 9326, HD 89744, HIP 50786, HR 4067, SAO 43309, NLTT 24128 [10] |
Database references |
---|
SIMBAD | The star |
| planet b |
Exoplanet Archive | data |
ARICNS | data |
At various times the star HD 89744 has been assigned a stellar classification of F7V,[3][12] F7IV-V,[13] and F8IV,[4][2] suggesting it is an F-type main-sequence star that is evolving onto the subgiant branch. It is ~8.4[7] billion years old with an inactive chromosphere[13] and is spinning with a projected rotational velocity of 9.3 km/s.[8] The star is 2.16[1] times the size of the Sun with 1.4[6] times the Sun's radius. It is a high metallicity star, showing a greater abundance of heavier elements than in the Sun. The star is radiating 6.4[7] times the luminosity of the Sun from its photosphere at an effective temperature of 6,381 K.[6]
In 2001, a faint co-moving companion was identified at an angular separation of 63.1″ from the primary.[14] This is equivalent to a linear projected separation of 2,456 AU (0.04 ly).[9] The companion, designated component B, is an L-class (~L0.5)[3] brown dwarf[14] with a mass of ~0.076 M☉.[9]
Planetary system
In April 2000, a planet was discovered using radial velocity measurements taken at Fred Lawrence Whipple Observatory and Lick Observatory.[12] The orbital parameters were updated in 2006 and 2007 using additional measurements.[15][16] A second planet with a much longer period was discovered in 2019.[17]
The HD 89744 planetary system[17]
Companion (in order from star) |
Mass |
Semimajor axis (AU) |
Orbital period (days) |
Eccentricity |
Inclination |
Radius |
b |
>8.35±0.18 MJ |
0.917±0.009 |
256.78±0.02 |
0.677±0.003 |
— |
— |
c |
>5.36±4.57 MJ |
8.3±1.8 |
6,974±2,161 |
0.29±0.12 |
— |
— |
See also
- List of extrasolar planets
References
- 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.
- 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. S2CID 119257644.
- Scholz, R. -D. (March 2016). "Overlooked wide companions of nearby F stars". Astronomy & Astrophysics. 587: 8. arXiv:1601.01896. Bibcode:2016A&A...587A..51S. doi:10.1051/0004-6361/201527965. S2CID 118348424. A51.
- Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 parsecs: The Northern Sample I". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
- Pizzolato, N.; et al. (September 2000). "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases". Astronomy and Astrophysics. 361: 614–628. Bibcode:2000A&A...361..614P.
- Sousa, S. G.; et al. (November 2018). "SWEET-Cat updated. New homogenous spectroscopic parameters". Astronomy & Astrophysics. 620: 13. arXiv:1810.08108. Bibcode:2018A&A...620A..58S. doi:10.1051/0004-6361/201833350. S2CID 119374557. A58.
- Metcalfe, Travis S.; Egeland, Ricky (January 2019). "Understanding the Limitations of Gyrochronology for Old Field Stars". The Astrophysical Journal. 871 (1): 6. arXiv:1811.11905. Bibcode:2019ApJ...871...39M. doi:10.3847/1538-4357/aaf575. S2CID 119405127. 39.
- Morris, Brett M.; et al. (September 2019). "Stellar Properties of Active G and K Stars: Exploring the Connection between Starspots and Chromospheric Activity". The Astronomical Journal. 158 (3): 16. arXiv:1907.00423. Bibcode:2019AJ....158..101M. doi:10.3847/1538-3881/ab2e04. S2CID 195767281. 101.
- Mugrauer, M.; et al. (2005). "Four new wide binaries among exoplanet host stars". Astronomy and Astrophysics. 440 (3): 1051–1060. arXiv:astro-ph/0507101. Bibcode:2005A&A...440.1051M. doi:10.1051/0004-6361:20042297.
- "HD 89744". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-14.
- Sinnott, Roger W.; Perryman, Michael A. C. (1997). Millennium Star Atlas. Vol. 2. Sky Publishing Corporation and the European Space Agency. p. 617. ISBN 0-933346-83-2.
- Korzennik, Sylvain G.; et al. (2000). "A High-Eccentricity Low-Mass Companion to HD 89744". The Astrophysical Journal Letters. 533 (2): L147–L150. arXiv:astro-ph/0003045. Bibcode:2000ApJ...533L.147K. doi:10.1086/312611. PMID 10770711.
- Wright, J. T. (September 2004). "Do We Know of Any Maunder Minimum Stars?". The Astronomical Journal. 128 (3): 1273–1278. arXiv:astro-ph/0406338. Bibcode:2004AJ....128.1273W. doi:10.1086/423221. S2CID 118975831.
- Wilson, J. C.; et al. (October 2001). "Three Wide-Separation L Dwarf Companions from the Two Micron All Sky Survey: Gliese 337C, Gliese 618.1B, and HD 89744B". The Astronomical Journal. 122 (4): 1989–2000. arXiv:astro-ph/0108424. Bibcode:2001AJ....122.1989W. doi:10.1086/323134. S2CID 17789028.
- Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701.
- Wittenmyer, Robert A.; et al. (2007). "Dynamical and Observational Constraints on Additional Planets in Highly Eccentric Planetary Systems". The Astronomical Journal. 134 (3): 1276–1284. arXiv:0706.1962. Bibcode:2007AJ....134.1276W. doi:10.1086/520880.
- Wittenmyer, Robert A.; et al. (2019). "Truly eccentric – I. Revisiting eight single-eccentric planetary systems". Monthly Notices of the Royal Astronomical Society. 484 (4): 5859–5867. arXiv:1901.08471. Bibcode:2019MNRAS.484.5859W. doi:10.1093/mnras/stz290.
Constellation of Ursa Major |
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На других языках
[de] HD 89744
HD 89744 ist ein etwa 130 Lichtjahre von der Erde entfernter Hauptreihenstern der Spektralklasse F7. Er liegt im Sternbild Großer Bär und hat eine scheinbare Helligkeit von 5,73 mag. HD 89744 ist ein Mitglied des AB-Doradus-Bewegungshaufens.
- [en] HD 89744
[es] HD 89744
HD 89744 (HR 4067 / HIP 50786 / GJ 9326)[1] es una estrella en la constelación de la Osa Mayor de magnitud aparente +5,73, visualmente situada cerca de Tania Australis (μ Ursae Majoris). Se encuentra a 130 años luz de distancia del Sistema Solar. En 2000 se anunció el descubrimiento de un planeta extrasolar en torno a esta estrella.[2]
[ru] HD 89744
HD 89744 — звезда, которая находится в созвездии Большая Медведица на расстоянии около 127 световых лет от нас. Вокруг звезды обращается, как минимум, одна планета.
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