ADS 7251

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ADS 7251
Observation data
Epoch J2000      Equinox J2000
Constellation Ursa Major
ADS 7251 A
Right ascension 09h 14m 22.7749s[1]
Declination 52° 41′ 11.792″[1]
Apparent magnitude (V) 7.64[2]
ADS 7251 B
Right ascension 09h 14m 24.6828s[3]
Declination 52h 41m 10.902s[3]
Apparent magnitude (V) 7.70[2]
Characteristics
ADS 7251 A (HD 79210)
Spectral type M0V[4]
Apparent magnitude (B) 9.05[2]
Apparent magnitude (G) 6.976[1]
Apparent magnitude (J) 4.89[a][5]
Apparent magnitude (H) 3.987[a][5]
Apparent magnitude (K) 3.99[a][5]
B−V color index +1.41[6]
J−H color index +0.90[b]
J−K color index +0.90[b]
ADS 7251 B (HD 79211)
Spectral type K7V[4]
Apparent magnitude (B) 9.04[2]
Apparent magnitude (G) 7.045[3]
Apparent magnitude (J) 4.779[a][5]
Apparent magnitude (H) 4.043[a][5]
Apparent magnitude (K) 4.14[a][5]
B−V color index +1.42[6]
J−H color index +0.74[b]
J−K color index +0.64[b]
Variable type Flare star
Astrometry
ADS 7251 A (HD 79210)
Radial velocity (Rv)11.245±0.0007[1] km/s
Proper motion (μ) RA: −1,545.787±0.018[1] mas/yr
Dec.: −569.053±0.018[1] mas/yr
Parallax (π)157.8879 ± 0.0197 mas[1]
Distance20.657 ± 0.003 ly
(6.3336 ± 0.0008 pc)
Absolute magnitude (MV)8.637[7]
ADS 7251 B
Radial velocity (Rv)12.104±0.0008[3] km/s
Proper motion (μ) RA: −1,573.040±0.018[3] mas/yr
Dec.: −659.906±0.018[3] mas/yr
Parallax (π)157.8825 ± 0.0211 mas[3]
Distance20.658 ± 0.003 ly
(6.3338 ± 0.0008 pc)
Absolute magnitude (MV)8.712[7]
Details[8]
A
Mass0.69±0.07 M☉
Radius0.58±0.02 R☉
Luminosity1.20±0.01 L☉
Surface gravity (log g)4.68±0.07 cgs
Temperature4,024±51 K
Rotation16.3+3.5
−1.3
Rotational velocity (v sin i)2.0±1.2 km/s
B
Mass0.64±0.07 M☉
Radius0.58±0.03 R☉
Luminosity1.20±0.01 L☉
Surface gravity (log g)4.68±0.07 cgs
Temperature4,005±51 K
Rotation16.61±0.04
Rotational velocity (v sin i)2.3±1.5 km/s
Age1–7 Gyr
Other designations
GJ 388, ADS 7251, WDS J09144+5241
A: BD+53°1320, HD 79210, HIP 45343
B: BD+53°1321, HD 79211, HIP 120005
Database references
SIMBADThe system
A
B

ADS 7251 is a binary star system 6.33 parsecs (20.66 light years) from the Sun. The components are near-identical red dwarfs.

ADS 7251 A is 0.06 magnitudes (six percent) brighter than ADS 7251 B. A catalogue of MK spectral classes lists both stars as secondary standards, with ADS 7251 A being class M0V and ADS 7251 B being class K7V, noted as being unusual in the brighter star having a later spectral type.[4] Other publications have described the stars as being both K7V, both M0V, or the primary being K7V and the secondary M0V.[9][8]

Planetary system

ADS 7251 B also known as Gliese 338B or HD 79211, is orbited by one known super-Earth planet detected by radial velocity.[8]

The ADS 7251 B (Gliese 338 B) planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 9.97+1.47
−1.38 M🜨 		0.141±0.005 24.45±0.02 0.11+0.11
−0.08 		— —

Notes

  1. ^ a b c d e f 2MASS infrared magnitudes flagged as unreliable or upper limits
  2. ^ a b c d Calculated from 2MASS magnitudes

References

  1. ^ a b c d e f g 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.
  2. ^ a b c d Huang, Y.; Liu, X. -W.; Yuan, H. -B.; Xiang, M. -S.; Chen, B. -Q.; Zhang, H. -W. (2015). "Empirical metallicity-dependent calibrations of effective temperature against colours for dwarfs and giants based on interferometric data". Monthly Notices of the Royal Astronomical Society. 454 (3): 2863. arXiv:1508.06080. Bibcode:2015MNRAS.454.2863H. doi:10.1093/mnras/stv1991. S2CID 118487917.
  3. ^ a b c d e f g 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.
  4. ^ a b c Kirkpatrick, J. D.; et al. (1991). "A standard stellar spectral sequence in the red/near-infrared - Classes K5 to M9". Astrophysical Journal Supplement Series. 77: 417. Bibcode:1991ApJS...77..417K. doi:10.1086/191611.
  5. ^ a b c d e f Cutri, R. M.; Skrutskie, M. F.; Van Dyk, S.; Beichman, C. A.; Carpenter, J. M.; Chester, T.; Cambresy, L.; Evans, T.; Fowler, J.; Gizis, J.; Howard, E.; Huchra, J.; Jarrett, T.; Kopan, E. L.; Kirkpatrick, J. D.; Light, R. M.; Marsh, K. A.; McCallon, H.; Schneider, S.; Stiening, R.; Sykes, M.; Weinberg, M.; Wheaton, W. A.; Wheelock, S.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". VizieR On-line Data Catalog: II/246. Originally Published in: 2003yCat.2246....0C. 2246. Bibcode:2003yCat.2246....0C.
  6. ^ a b Bobylev, V. V.; Goncharov, G. A.; Bajkova, A. T. (2007). "VizieR Online Data Catalog: Orion Spiral Arm CAtalogue (OSACA) (Bobylev+, 2006)". Vizier Online Data Catalog. Bibcode:2007yCat..90830821B.
  7. ^ a b Houdebine, Éric R.; Mullan, D. J.; Doyle, J. G.; de la Vieuville, Geoffroy; Butler, C. J.; Paletou, F. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal. 158 (2): 56. arXiv:1905.07921. Bibcode:2019AJ....158...56H. doi:10.3847/1538-3881/ab23fe. S2CID 159041104.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  8. ^ a b c González-Álvarez, E.; Osorio, M. R. Zapatero; Caballero, J. A.; Sanz-Forcada, J.; Béjar, V. J. S.; González-Cuesta, L.; Dreizler, S.; Bauer, F. F.; Rodríguez, E.; Tal-Or, L.; Zechmeister, M. (May 2020). "The CARMENES search for exoplanets around M dwarfs. A super-Earth planet orbiting HD 79211 (GJ 338 B)". Astronomy & Astrophysics. 637: A93. arXiv:2003.13052. Bibcode:2020A&A...637A..93G. doi:10.1051/0004-6361/201937050. ISSN 0004-6361.
  9. ^ Skiff, B. A. (2014). "VizieR Online Data Catalog: Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)". VizieR On-line Data Catalog: B/Mk. Originally Published in: Lowell Observatory (October 2014). 1. Bibcode:2014yCat....1.2023S.
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