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Delta Crateris

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δでるた Crateris
Location of δでるた Crateris (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Crater
Right ascension 11h 19m 20.4473s[1]
Declination −14° 46′ 42.7434″
Apparent magnitude (V) 3.56[2]
Characteristics
Spectral type K0 III[2]
B−V color index 1.12[2]
Astrometry
Radial velocity (Rv)−4.94±0.21[3] km/s
Proper motion (μみゅー) RA: −122.958[1] mas/yr
Dec.: +207.083[1] mas/yr
Parallax (πぱい)17.017 ± 0.1617 mas[1]
Distance192 ± 2 ly
(58.8 ± 0.6 pc)[1]
Absolute magnitude (MV)−0.321[4]
Details[5]
Mass1.468±0.165 M☉
Radius16.2±0.6 R☉
Luminosity171.4±9.0[6] L☉
Surface gravity (log g)2.46±0.09 cgs
Temperature4,605±33 K
Metallicity [Fe/H]−0.04±0.02 dex
Age2.424±0.879 Gyr
Other designations
δでるた Crt, 12 Crateris, BD−13° 3345, FK5 426, HD 98430, HIP 55282, HR 4382, SAO 156605.[7]
Database references
SIMBADdata

Delta Crateris (δでるた Crt, δでるた Crateris) is a solitary[8] star in the southern constellation of Crater. With an apparent visual magnitude of 3.56,[2] it is the brightest star[9] in this rather dim constellation. It has an annual parallax shift of 17.017 mas as measured from Earth,[1] indicating Delta Crateris lies at a distance of 192 ly from the Sun.

Characteristics

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This is an evolved orange-hued giant star belonging to the spectral class K0 III. Delta Crateris is a member of the so-called red clump, indicating that it is generating energy through the thermonuclear fusion of helium at its core.[4] The star has an estimated 1.47 times the mass of the Sun but has expanded to 16.2 times the Sun's radius.[5]

The metallicity of the star – what astronomers term the abundance of elements other than hydrogen and helium – is only 40% that of the Sun.[5][a] It is around 2.89[10] billion years old with a rotation rate that is too small to measure; the projected rotational velocity is 0.0 km/s.[3] Delta Crateris is radiating 171.4±9.0 as much luminosity as the Sun[10] from its outer envelope at an effective temperature of 4,605 K.[5]

Notes

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  1. ^ The abundance is estimated by taking [Fe/H] to the power of ten:
              10[Fe/H] = 10-0.4 = 0.4

References

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  1. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c d Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M.
  3. ^ a b Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209, S2CID 121883397.
  4. ^ a b Soubiran, C.; et al. (2008), "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants", Astronomy and Astrophysics, 480 (1): 91–101, arXiv:0712.1370, Bibcode:2008A&A...480...91S, doi:10.1051/0004-6361:20078788, S2CID 16602121.
  5. ^ a b c d Gomes da Silva, J.; Santos, N. C.; Adibekyan, V.; Sousa, S. G.; Campante, T. L.; Figueira, P.; Bossini, D.; Delgado-Mena, E.; Monteiro, M. J. P. F. G.; de Laverny, P.; Recio-Blanco, A.; Lovis, C. (2021-02-01). "Stellar chromospheric activity of 1674 FGK stars from the AMBRE-HARPS sample. I. A catalogue of homogeneous chromospheric activity". Astronomy and Astrophysics. 646: A77. arXiv:2012.10199. doi:10.1051/0004-6361/202039765. ISSN 0004-6361. Delta Crateris' database entry at VizieR.
  6. ^ Berio, P.; et al. (November 2011), "Chromosphere of K giant stars. Geometrical extent and spatial structure detection", Astronomy & Astrophysics, 535: A59, arXiv:1109.5476, Bibcode:2011A&A...535A..59B, doi:10.1051/0004-6361/201117479, S2CID 17171848.
  7. ^ "del Crt". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-02.{{cite web}}: CS1 maint: postscript (link)
  8. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  9. ^ Ridpath, Ian (2012), A Dictionary of Astronomy, OUP Oxford, p. 108, ISBN 978-0199609055.
  10. ^ a b Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
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