Astronomy:82 Virginis
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Virgo |
| Right ascension | 13h 41m 36.770s[1] |
| Declination | −08° 42′ 10.73″[1] |
| Apparent magnitude (V) | 5.01[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M1III |
| Apparent magnitude (U) | 8.59[4] |
| Apparent magnitude (B) | 6.64[4] |
| Apparent magnitude (G) | 4.149[4] |
| Apparent magnitude (J) | 1.68[4] |
| Apparent magnitude (H) | 0.88[4] |
| Apparent magnitude (K) | 0.64[4] |
| B−V color index | 1.623±0.009[5] |
| Astrometry | |
| Radial velocity (Rv) | −36.6±2[4] km/s |
| Proper motion (μ) | RA: -91.65[5] mas/yr Dec.: 40.28[5] mas/yr |
| Parallax (π) | 5.4376 ± 0.2897[1] mas |
| Distance | 600 ± 30 ly (184 ± 10 pc) |
| Absolute magnitude (MV) | −0.7[6] |
| Details | |
| Mass | 6.5[7] M☉ |
| Radius | 54[1] R☉ |
| Luminosity | 812[8] L☉ |
| Surface gravity (log g) | 0.714[2] cgs |
| Temperature | 3,675[2] K |
| Rotational velocity (v sin i) | 2.3±1[9] km/s |
| Age | 50[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
82 Virginis, also known as m Virginis, is a star in the constellation Virgo. It is located 160 pc (520 light-years) from Earth based on a parallax of 6.249±0.2611 mas from Gaia Data Release 3.[1] It is a red giant, based on its spectral type of M1III.[4] Its apparent magnitude is 5.01.[2]
Characteristics
82 Virginis is a red giant star, based on its spectral type of M1III,[4] where M means that it is an M-type star and III is the luminosity class, meaning it is a giant star. The star is 54 times larger than the Sun.[1] The effective temperature of the star is 3,675 K,[2] which is 2,197 degrees cooler than the solar temperature of 5,772 K. Its rotational velocity is 2.3 km/s.[9] The angular diameter of the star, as measured from the CHARM survey, is of 4.48±0.28 mas.[10] At the current distance, this would lead to a radius of 77 R☉, somewhat larger than the radius derived by Gaia DR3.
The parallax of the star is measured at 5.4376±0.2897 mas from Gaia DR3, translating to a distance of 184 parsecs (600 light-years) from Earth.[1] The star is moving towards Earth at a velocity of 36.6 km/s.[4] Its apparent magnitude is 5.01,[2] making it visible to the naked eye.[lower-alpha 1]
Notes
- ↑ According to the Bortle scale
References
- ↑ 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.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Ghosh, Supriyo; Mondal, Soumen; Das, Ramkrishna; Khata, Dhrimadri (2019-01-29). "Spectral Calibration of K$-$M Giants from medium resolution near-infrared HK-band spectra". Monthly Notices of the Royal Astronomical Society. doi:10.1093/mnras/stz299. ISSN 0035-8711.
- ↑ Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal 104: 275. doi:10.1086/116239. Bibcode: 1992AJ....104..275E.
- ↑ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 "82 Vir". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=82+Vir.
- ↑ 5.0 5.1 Template:Cite New HIP red.
- ↑ Pace, G.; Pasquini, L.; Ortolani, S. (2003). "The Wilson-Bappu effect: A tool to determine stellar distances". Astronomy and Astrophysics 401 (3): 997. doi:10.1051/0004-6361:20030163. Bibcode: 2003A&A...401..997P.
- ↑ 7.0 7.1 Borisov, Sviatoslav B.; Chilingarian, Igor V.; Rubtsov, Evgenii V.; Ledoux, Cédric; Melo, Claudio; Grishin, Kirill A.; Katkov, Ivan Yu.; Goradzhanov, Vladimir S. et al. (2023). "New Generation Stellar Spectral Libraries in the Optical and Near-infrared. I. The Recalibrated UVES-POP Library for Stellar Population Synthesis". The Astrophysical Journal Supplement Series 266 (1): 11. doi:10.3847/1538-4365/acc321. Bibcode: 2023ApJS..266...11B.
- ↑ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental parameters and infrared excesses of Hipparcos stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M.
- ↑ 9.0 9.1 Zamanov, R. K.; Bode, M. F.; Melo, C. H. F.; Stateva, I. K.; Bachev, R.; Gomboc, A.; Konstantinova-Antova, R.; Stoyanov, K. A. (2008-10-11). "Rotational velocities of the giants in symbiotic stars: III. Evidence of fast rotation in S-type symbiotics". Monthly Notices of the Royal Astronomical Society 390 (1): 377–382. doi:10.1111/j.1365-2966.2008.13751.x. Bibcode: 2008MNRAS.390..377Z.
- ↑ Richichi, A.; Percheron, I. (2002-05-01). "CHARM: A Catalog of High Angular Resolution Measurements". Astronomy and Astrophysics 386 (2): 492–503. doi:10.1051/0004-6361:20020236. ISSN 0004-6361. Bibcode: 2002A&A...386..492R. https://www.aanda.org/10.1051/0004-6361:20020236/pdf.
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