Star in the constellation Ara
Gliese 674 (GJ 674) is a small red dwarf star with an exoplanetary companion in the southern constellation of Ara . It is too faint to be visible to the naked eye, having an apparent visual magnitude of 9.38[2] and an absolute magnitude of 11.09.[2] The system is located at a distance of 14.8 light-years from the Sun based on parallax measurements,[1] but is drifting closer with a radial velocity of −2.9 km/s.[5] It is a candidate member of the 200 million year old Castor stream of co-moving stars.[11]
This is a low-mass M-type main-sequence star with a stellar classification of M3V.[3] The star is weakly active and show star spots on a regular basis. Even low activity red dwarfs can flare , and in 2018 this star was observed emitting a hot ultraviolet flare with a total energy of 5.6× 1023 Joules and a duration of a few hours. GJ 674 is at an intermediate stage of spin-down with a rotation period of 33.4 days, suggesting an age of up to a few billion years.[12] It is smaller and less massive than the Sun, and is radiating just 1.6%[9] of the Sun's luminosity from its photosphere at an effective temperature of 3,404 K.[7]
Planetary system
On January 7, 2007, Bonfils used the HARPS spectrograph in ESO and found an intermediate mass planet orbiting close to the red dwarf star in an eccentric orbit.[9] This system is a promising candidate for detecting radio emission caused by interaction between the planet and the stellar wind .[13]
See also
References
^ a b c d 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 d e 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 .
^ a b c Torres, G. R.; et al. (December 2006). "Search for associations containing young stars (SACY). I. Sample and searching method". Astronomy and Astrophysics . 460 (3): 695–708. arXiv :astro-ph/0609258 . Bibcode :2006A&A...460..695T . doi :10.1051/0004-6361:20065602 . S2CID 16080025 .
^ a b Koen, C.; et al. (April 21, 2010). "UBV(RI)C JHK observations of Hipparcos-selected nearby stars" . Monthly Notices of the Royal Astronomical Society . 403 (4): 1949–1968. Bibcode :2010MNRAS.403.1949K . doi :10.1111/j.1365-2966.2009.16182.x .
^ a b Soubiran, C.; et al. (2018). "Gaia Data Release 2. The catalogue of radial velocity standard stars". Astronomy and Astrophysics . 616 : A7. arXiv :1804.09370 . Bibcode :2018A&A...616A...7S . doi :10.1051/0004-6361/201832795 . S2CID 52952408 .
^ Brown, A. G. A. ; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties" . Astronomy & Astrophysics . 649 : A1. arXiv :2012.01533 . Bibcode :2021A&A...649A...1G . doi :10.1051/0004-6361/202039657 . S2CID 227254300 . (Erratum: doi :10.1051/0004-6361/202039657e ) . Gaia EDR3 record for this source at VizieR .
^ a b c d e f Pineda, J. Sebastian; et al. (September 2021). "The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars" . The Astrophysical Journal . 918 (1): 23. arXiv :2106.07656 . Bibcode :2021ApJ...918...40P . doi :10.3847/1538-4357/ac0aea . S2CID 235435757 . 40.
^ Suárez Mascareño, A.; et al. (September 2015). "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators" . Monthly Notices of the Royal Astronomical Society . 452 (3): 2745–2756. arXiv :1506.08039 . Bibcode :2015MNRAS.452.2745S . doi :10.1093/mnras/stv1441 . S2CID 119181646 .
^ a b c d Bonfils, X.; et al. (2007). "The HARPS search for southern extra-solar planets. X. A m sin i = 11 M🜨 planet around the nearby spotted M dwarf GJ 674" . Astronomy and Astrophysics . 474 (1): 293–299. arXiv :0704.0270 . Bibcode :2007A&A...474..293B . doi :10.1051/0004-6361:20077068 . S2CID 119671420 . Archived from the original on 2014-12-28. Retrieved 2013-09-08 .
^ "CD-46 11540" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-11-22 .
^ Caballero, J. A. (May 2010). "Reaching the boundary between stellar kinematic groups and very wide binaries . II. α Librae + KU Librae: a common proper motion system in Castor separated by 1.0 pc". Astronomy and Astrophysics . 514 : 7. arXiv :1001.5432 . Bibcode :2010A&A...514A..98C . doi :10.1051/0004-6361/200913986 . S2CID 118875432 . A98.
^ Froning, C. S.; et al. (February 2019). "A Hot Ultraviolet Flare on the M Dwarf Star GJ 674" . The Astrophysical Journal Letters . 871 (2): 6. arXiv :1901.08647 . Bibcode :2019ApJ...871L..26F . doi :10.3847/2041-8213/aaffcd . S2CID 119427057 . L26.
^ Vidotto, A. A.; et al. (September 2019). "Can we detect aurora in exoplanets orbiting M dwarfs?" . Monthly Notices of the Royal Astronomical Society . 488 (1): 633–644. arXiv :1906.07089 . Bibcode :2019MNRAS.488..633V . doi :10.1093/mnras/stz1696 .
External links
Notes
Primary member type
Celestial objects by systems.