Astronomy:47 Capricorni

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Short description: Star in the constellation Capricornus
47 Capricorni
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A light curve for AG Capricorni, plotted from Hipparcos data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Capricornus
Right ascension  21h 46m 16.26931s[2]
Declination −09° 16′ 33.3668″[2]
Apparent magnitude (V) 6.00[3] (5.90 - 6.14)[4]
Characteristics
Evolutionary stage AGB[5]
Spectral type M2III[6]
B−V color index 1.629±0.010[3]
Variable type SRb[4]
Astrometry
Radial velocity (Rv)+19.80±0.89[7] km/s
Proper motion (μ) RA: +18.355[2] mas/yr
Dec.: +7.562[2] mas/yr
Parallax (π)3.4703 ± 0.0825[2] mas
Distance940 ± 20 ly
(288 ± 7 pc)
Absolute magnitude (MV)−1.76[3]
Details
Mass1.7[8] M☉
Radius122[9] R☉
Luminosity1,672[2] L☉
Surface gravity (log g)1.25[10] cgs
Temperature3,646[9] K
Metallicity [Fe/H]−0.28[8] dex
Age224[10] Myr
Other designations
c2 Cap, 47 Cap, AG Cap, BD−09°5833, HD 207005, HIP 107487, HR 8318, SAO 145648[11]
Database references
SIMBADdata

47 Capricorni is a variable star located around 940 light years from the Sun[2] in the southern constellation Capricornus,[11] near the northern border with Aquarius. It has the variable star designation of AG Capricorni and a Bayer designation of c2 Capricorni;[12] 47 Capricorni is the Flamsteed designation. This object is visible to the naked eye as a dim, red-hued point of light with an apparent visual magnitude that varies between 5.90 and 6.14. The star is receding from the Earth with a heliocentric radial velocity of +20 km/s.[7]

In 1963, Alan William James Cousins announced that 47 Capricorni is a variable star.[13] It was given its variable star designation in 1973.[14]

This is an aging red giant star with a stellar classification of M2III.[6] It is a semiregular variable star of subtype SRb with a period of 30.592 days and a maximum brightness of 5.9 magnitude.[4] With the supply of hydrogen at its core exhausted, the star has expanded to around 122 times the Sun's radius.[9] It is radiating 1,672 times the luminosity of the Sun[2] from its swollen photosphere at an effective temperature of 3,646 K.[9]

References

  1. ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 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.
  3. ↑ 3.0 3.1 3.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  4. ↑ 4.0 4.1 4.2 Samus, N. N. et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS 1. Bibcode: 2009yCat....102025S. 
  5. ↑ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E. 
  6. ↑ 6.0 6.1 Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars". Michigan Spectral Survey 5. Bibcode: 1999MSS...C05....0H. 
  7. ↑ 7.0 7.1 Famaey, B. et al. (2009). "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations". Astronomy and Astrophysics 498 (2): 627. doi:10.1051/0004-6361/200810698. Bibcode: 2009A&A...498..627F. 
  8. ↑ 8.0 8.1 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K. 
  9. ↑ 9.0 9.1 9.2 9.3 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  10. ↑ 10.0 10.1 Kordopatis, G.; Schultheis, M.; McMillan, P. J.; Palicio, P. A.; De Laverny, P.; Recio-Blanco, A.; Creevey, O.; Álvarez, M. A. et al. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics 669: A104. doi:10.1051/0004-6361/202244283. Bibcode: 2023A&A...669A.104K. 
  11. ↑ 11.0 11.1 "47 Cap". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=47+Cap. 
  12. ↑ Kostjuk, N. D. (2002). "HD 207005". HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index. Institute of Astronomy of Russian Academy of Sciences; CDS. http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=IV/27A/catalog&recno=3684.  IV/27A
  13. ↑ Cousins, A. W. J. (1963). "Photometric Data for Stars in the Equatorial Zone (Third List)". Monthly Notes of the Astron. Soc. Southern Africa 22: 12. Bibcode: 1963MNSSA..22...12C. 
  14. ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (October 1973). "59th Name-List of Variable Stars". Information Bulletin on Variable Stars 834. Bibcode: 1973IBVS..834....1K. https://ibvs.konkoly.hu/pub/ibvs/0801/0834.pdf. Retrieved 8 December 2024. 



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