Astronomy:ADS 7251

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Short description: Binary star system in the constellation Ursa Major

Coordinates: Sky map 09h 14m 22.7749s, +52° 41′ 11.792″

ADS 7251
ADS 7251 is located in the constellation Ursa Major
ADS 7251 is located in the constellation Ursa Major
ADS 7251
Location of ADS 7251 in the constellation Ursa Major

Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|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[lower-alpha 1][5]
Apparent magnitude (H) 3.987[lower-alpha 1][5]
Apparent magnitude (K) 3.99[lower-alpha 1][5]
B−V color index +1.41[6]
J−H color index +0.90[lower-alpha 2]
J−K color index +0.90[lower-alpha 2]
ADS 7251 B (HD 79211)
Spectral type K7V[4]
Apparent magnitude (B) 9.04[2]
Apparent magnitude (G) 7.054[3]
Apparent magnitude (J) 4.779[lower-alpha 1][5]
Apparent magnitude (H) 4.043[lower-alpha 1][5]
Apparent magnitude (K) 4.14[lower-alpha 1][5]
B−V color index +1.42[6]
J−H color index +0.74[lower-alpha 2]
J−K color index +0.64[lower-alpha 2]
Astrometry
ADS 7251 A (HD 79210)
Radial velocity (Rv)11.245±0.0007[1] km/s
Proper motion (μ) RA: −1,545.787(18)[1] mas/yr
Dec.: −569.053(18)[1] mas/yr
Parallax (π)157.8879 ± 0.0197[1] mas
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(18)[3] mas/yr
Dec.: −659.906(19)[3] mas/yr
Parallax (π)157.8825 ± 0.0211[3] mas
Distance20.658 ± 0.003 ly
(6.3338 ± 0.0008 pc)
Absolute magnitude (MV)8.712[7]
Orbit[8]
Period (P)975 yr
Semi-major axis (a)16.725″
Eccentricity (e)0.28
Details[9]
A
Mass0.69±0.07 M☉
Radius0.58±0.02 R☉
Luminosity0.0789±0.0038 L☉
Surface gravity (log g)4.68±0.07 cgs
Temperature4,024±51 K
Metallicity [Fe/H]−0.05±0.16 dex
Rotation16.3+3.5
−1.3 d
Rotational velocity (v sin i)2.9±1.2 km/s
Age1–7 Gyr
B
Mass0.64±0.07 M☉
Radius0.58±0.03 R☉
Luminosity0.0792±0.0031 L☉
Surface gravity (log g)4.68±0.07 cgs
Temperature4,005±51 K
Rotation16.61±0.04 d
Rotational velocity (v sin i)2.3±1.5 km/s
Age1–7 Gyr
Other designations
A: {{{names1}}}
B: {{{names2}}}
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 separated by 17″ in 2019.

The two stars share a mildly eccentric orbit with a semimajor axis of 16.725″ and a period of 975 years. Their separation has closed from 21.1″ when they were discovered by F. G. W. Struve in 1821 to 16.9″ in 2019. Struve also documented two much fainter stars about 3′ from the two red dwarfs.[10]

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.[11][9]

Planetary system

ADS 7251 B, also known as Gliese 338 B or HD 79211, is orbited by one known planet discovered in 2020 by radial velocity. Though described as a super-Earth by its discovery paper, it is closer in mass to Uranus.[9] An independent confirmation of the planet was published in 2022.[12]

The ADS 7251 B (Gliese 338 B) planetary system[12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥10.6±1.2 M⊕ 0.142±0.005 24.422±0.014 0.109+0.100
−0.075 		— —

Notes

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 2MASS infrared magnitudes flagged as unreliable or upper limits
  2. ↑ 2.0 2.1 2.2 2.3 Calculated from 2MASS magnitudes

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 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. doi:10.1093/mnras/stv1991. Bibcode: 2015MNRAS.454.2863H. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  4. ↑ 4.0 4.1 4.2 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. doi:10.1086/191611. Bibcode: 1991ApJS...77..417K. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues 2246: II/246. Bibcode: 2003yCat.2246....0C. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246. 
  6. ↑ 6.0 6.1 Bobylev, V. V.; Goncharov, G. A.; Bajkova, A. T. (2007). "VizieR Online Data Catalog: Orion Spiral Arm CAtalogue (OSACA) (Bobylev+, 2006)". VizieR On-line Data Catalog. Bibcode: 2007yCat..90830821B. 
  7. ↑ 7.0 7.1 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. doi:10.3847/1538-3881/ab23fe. Bibcode: 2019AJ....158...56H. 
  8. ↑ Malkov, O. Yu. et al. (2012). "Dynamical Masses of a Selected Sample of Orbital Binaries". Astronomy & Astrophysics 546: 5. doi:10.1051/0004-6361/201219774. A69. Bibcode: 2012A&A...546A..69M. 
  9. ↑ 9.0 9.1 9.2 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. et al. (May 2020). "The CARMENES search for exoplanets around M dwarfs. A super-Earth planet orbiting HD 79211 (GJ 338 B)". Astronomy & Astrophysics 637: A93. doi:10.1051/0004-6361/201937050. ISSN 0004-6361. Bibcode: 2020A&A...637A..93G. 
  10. ↑ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (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. 
  11. ↑ 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. 
  12. ↑ 12.0 12.1 Ditomasso, Victoria et al. (2023), "Independent Validation of the Temperate Super-Earth HD 79211 b using HARPS-N", The Astronomical Journal 165 (2): 38, doi:10.3847/1538-3881/ac9ccd, Bibcode: 2023AJ....165...38D 



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