HD 135530
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes[2] |
| Right ascension | 15h 14m 10.31472s[3] |
| Declination | +42° 10′ 17.0573″[3] |
| Apparent magnitude (V) | 6.13 – 6.15[4] |
| Characteristics | |
| Evolutionary stage | AGB[5] |
| Spectral type | M2IIIa[6] |
| B−V color index | +1.62[7] |
| Variable type | unclassified[8] |
| Astrometry | |
| Radial velocity (Rv) | −4.42±0.21[9] km/s |
| Proper motion (μ) | RA: 20.065[3] mas/yr Dec.: −14.631[3] mas/yr |
| Parallax (π) | 3.1796±0.0484 mas[3] |
| Distance | 1,030 ± 20 ly (315 ± 5 pc) |
| Absolute magnitude (MV) | −1.68[2] |
| Details | |
| Mass | 1.2[10] M☉ |
| Radius | 79[11] R☉ |
| Luminosity | 1,204[11] L☉ |
| Surface gravity (log g) | 0.56[10] cgs |
| Temperature | 3,820[11] K |
| Metallicity [Fe/H] | −0.17[10] dex |
| Other designations | |
| NSV 20281, BD+42°2577, HD 135530, HIP 74571, HR 5677, SAO 45445 | |
| Database references | |
| SIMBAD | data |
HD 135530 is a variable star in the northern constellation of Boötes. With an average apparent magnitude of 6.14,[8] it is very faintly visible to the naked eye under excellent observing conditions.
HD 135530 has evolved into a red giant on the asymptotic giant branch, meaning that it has exhausted its core helium and is fusing hydrogen and helium in shells outside the core.[5] Its photosphere has expanded to 79 R☉ at an effective temperature of 3820 K and shows a spectrum classified as M2IIIa, with IIIa indicating a star slightly more luminous than a typical giant.
Although listed only as a suspected variable in the General Catalogue of Variable Stars, observations by the MASCARA team have shown that its brightness is in fact variable, with a period of about 20 days.[1]
References
[edit]- ^ a b Burggraaff, O.; Talens, G. J. J.; Spronck, J.; Lesage, A. L.; Stuik, R.; Otten, G. P. P. L.; Van Eylen, V.; Pollacco, D.; Snellen, I. A. G. (September 2018). "Studying bright variable stars with the Multi-site All-Sky CAmeRA (MASCARA)". Astronomy and Astrophysics. 617: A32. arXiv:1806.02247. Bibcode:2018A&A...617A..32B. doi:10.1051/0004-6361/201833142.
- ^ a b Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- ^ a b c d e 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.
- ^ Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
- ^ a b Eggen, Olin J. (1992). "Asymptotic Giant Branch Stars Near the Sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239.
- ^ Hoffleit, D.; Warren Jr, W. H. (1991). Bright Star Catalogue (5th Revised (Preliminary Version) ed.). Astronomical Data Center, NSSDC/ADC. Retrieved 2015-08-17.
- ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. SIMBAD. Bibcode:1986EgUBV........0M.
- ^ a b "NSV 20281". The International Variable Star Index. AAVSO. Retrieved 21 April 2025.
- ^ Famaey, B.; et al. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
- ^ a b c Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. S2CID 131780028.
- ^ a b c Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
