Astronomy:NO Aurigae
  | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 40m 42.050s[1] |
| Declination | +31° 55′ 14.20″[1] |
| Characteristics | |
| Evolutionary stage | Asymptotic giant branch[2] |
| Spectral type | M2S Iab[3] |
| U−B color index | +2.22[4] |
| B−V color index | +2.09[4] |
| R−I color index | +1.41[4] |
| Variable type | LC[3] |
| Astrometry | |
| Radial velocity (Rv) | 7.21±0.45[5] km/s |
| Proper motion (μ) | RA: 0.061±0.093[1] mas/yr Dec.: −2.959±0.051[1] mas/yr |
| Parallax (π) | 0.9189 ± 0.0930[1] mas |
| Distance | approx. 3,500 ly (approx. 1,100 pc) |
| Absolute magnitude (MV) | −5.88[6] |
| Details | |
| Mass | 4.93[7] M☉ |
| Radius | 269[8] R☉ |
| Luminosity | 9,075[8] L☉ |
| Surface gravity (log g) | −0.037[8] cgs |
| Temperature | 3,435[8] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
NO Aurigae is a pulsating variable star in the constellation Auriga. It is an unusually-luminous asymptotic giant branch star about 3,500 light years away.
Variability
NO Aurigae is listed in the General Catalogue of Variable Stars as a slow irregular variable, indicating that no regularity could be found in the brightness variations. Other studies have suggested possible periods of 102.1, 173, and 226 days, and would classify it as a semiregular variable star.[10] The maximum visual magnitude range is 6.05–6.50.[10]
Properties
Most studies of NO Aurigae treat it as a supergiant member of the Auriga OB1 stellar association at about 1.4 kpc.[11][12] On this basis it would have a luminosity around 67,000 L☉ and a radius around 630 R☉.[6][11]
NO Aurigae is an MS star, intermediate between spectral type M and S. These are typically Asymptotic Giant Branch stars which can appear with supergiant spectra due to their large size and low mass.[2] Possible detection of Technetium in the spectrum is a symptom of the third dredge-up which occurs only in late AGB stars.[12]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 2.0 2.1 Guandalini, R.; Busso, M. (2008). "Infrared photometry and evolution of mass-losing AGB stars. II. Luminosity and colors of MS and S stars". Astronomy and Astrophysics 488 (2): 675–684. doi:10.1051/0004-6361:200809932. Bibcode: 2008A&A...488..675G.
- ↑ 3.0 3.1 Cite error: Invalid
<ref>tag; no text was provided for refs namedgcvs - ↑ 4.0 4.1 4.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272. Bibcode: 2005A&A...430..165F.
- ↑ 6.0 6.1 Cite error: Invalid
<ref>tag; no text was provided for refs namedlevesque - ↑ Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten 331 (4): 349. doi:10.1002/asna.200911355. Bibcode: 2010AN....331..349H.
- ↑ 8.0 8.1 8.2 8.3 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society 471 (1): 770. doi:10.1093/mnras/stx1433. Bibcode: 2017MNRAS.471..770M.
- ↑ "Hipparcos Tools Interactive Data Access". ESA. https://www.cosmos.esa.int/web/hipparcos/interactive-data-access.
- ↑ 10.0 10.1 Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25 25: 47. Bibcode: 2006SASS...25...47W.
- ↑ 11.0 11.1 Mauron, N.; Josselin, E. (2011). "The mass-loss rates of red supergiants and the de Jager prescription". Astronomy and Astrophysics 526: A156. doi:10.1051/0004-6361/201013993. Bibcode: 2011A&A...526A.156M.
- ↑ 12.0 12.1 Josselin, E.; Plez, B. (2007). "Atmospheric dynamics and the mass loss process in red supergiant stars". Astronomy and Astrophysics 469 (2): 671. doi:10.1051/0004-6361:20066353. Bibcode: 2007A&A...469..671J.
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