Astronomy:Delta Crateris
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Crater |
| Right ascension | 11h 19m 20.4473s[1] |
| Declination | −14° 46′ 42.743″[1] |
| Apparent magnitude (V) | 3.56[2] |
| Characteristics | |
| Evolutionary stage | red clump[3] |
| Spectral type | K0 III[2] |
| B−V color index | 1.12[2] |
| Astrometry | |
| Radial velocity (Rv) | −4.94±0.21[4] km/s |
| Proper motion (μ) | RA: −122.958[1] mas/yr Dec.: +207.083[1] mas/yr |
| Parallax (π) | 17.017 ± 0.1617[1] mas |
| Distance | 192 ± 2 ly (58.8 ± 0.6 pc) |
| Absolute magnitude (MV) | −0.321[3] |
| Details[5] | |
| Mass | 1.47 ± 0.2 M☉ |
| Radius | 20.14±0.48 R☉ |
| Luminosity | 154.8±4.9 L☉ |
| Surface gravity (log g) | 2.00 ± 0.08 cgs |
| Temperature | 4,540 ± 40 K |
| Metallicity [Fe/H] | −0.43±0.10 dex |
| Age | 2.89[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Crateris (δ Crt, δ 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
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.[3] The star has an estimated 1.47 times the mass of the Sun but has expanded to 20 times the Sun's radius.[5]
It is around 2.89[6] billion years old with a rotation rate that is too small to measure; the projected rotational velocity is 0.0 km/s.[4] Delta Crateris is radiating 171.4±9.0 as much luminosity as the Sun[6] from its outer envelope at an effective temperature of 4,540 K.[5]
This star is occasionally called by the name Labrum, usually in an astrological context.[10]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 2.3 Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics 352: 495–507, Bibcode: 1999A&A...352..495M.
- ↑ 3.0 3.1 3.2 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, doi:10.1051/0004-6361:20078788, Bibcode: 2008A&A...480...91S.
- ↑ 4.0 4.1 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, doi:10.1088/0004-6256/135/1/209, Bibcode: 2008AJ....135..209M.
- ↑ 5.0 5.1 5.2 Reffert, Sabine; Bergmann, Christoph; Quirrenbach, Andreas; Trifonov, Trifon; Künstler, Andreas (2015-02-01). "Precise radial velocities of giant stars. VII. Occurrence rate of giant extrasolar planets as a function of mass and metallicity". Astronomy and Astrophysics 574: A116. doi:10.1051/0004-6361/201322360. ISSN 0004-6361. Bibcode: 2015A&A...574A.116R.
- ↑ 6.0 6.1 6.2 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal 150 (3): 88, doi:10.1088/0004-6256/150/3/88, Bibcode: 2015AJ....150...88L.
- ↑ "del Crt". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=del+Crt.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
- ↑ Ridpath, Ian (2012), A Dictionary of Astronomy, OUP Oxford, p. 108, ISBN 978-0199609055, https://books.google.com/books?id=O31j9UJ3U4oC&pg=PA108.
- ↑ Robson, Vivian E. (1923). The Fixed Stars And Constellations In Astrology. p. 110. https://archive.org/details/in.ernet.dli.2015.128091/page/n103/mode/2up.
External links
- Kaler, James B., "Delta Crateris", Stars (University of Illinois), http://stars.astro.illinois.edu/sow/deltacrt.html
 |  |
