Astronomy:HD 135438
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Short description: Red giant star in the constellation Boötes
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | 15h 14m 06.04269s[2] |
| Declination | +31° 47′ 16.2454″[2] |
| Apparent magnitude (V) | 5.97[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[4] |
| Spectral type | K5III[5] or M0III[4] |
| B−V color index | 1.52[6] |
| Astrometry | |
| Radial velocity (Rv) | −5.68±0.59[2] km/s |
| Proper motion (μ) | RA: +41.485[2] mas/yr Dec.: −28.200[2] mas/yr |
| Parallax (π) | 5.0111 ± 0.1361[2] mas |
| Distance | 650 ± 20 ly (200 ± 5 pc) |
| Absolute magnitude (MV) | −0.33[7] |
| Details[4] | |
| Mass | 1.59±0.08 M☉ |
| Radius | 50.15±2.59 R☉ |
| Luminosity | 734+37 −34 L☉ |
| Surface gravity (log g) | 1.17±0.14 cgs |
| Temperature | 4,032±30 K |
| Metallicity [Fe/H] | −0.36±0.08 dex |
| Rotation | 495? days |
| Rotational velocity (v sin i) | 4.72 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 135438 is a red giant star in the northern constellation of Boötes. With an apparent magnitude of 6.0, it lies about 650 light-years away. HD 135438 has a magnitude 9.36 visual companion at an angular separation of 118.2″ along a position angle of 158° (as of 2012).[9] Gaia Data Release 3 parallaxes indicate that the visual companion is an unrelated background star.[10]
The star displays periodic radial velocity variations, likely caused by both intrinsic variability and an orbiting companion star, making this a probable single-lined spectroscopic binary. The companion star has at least half the mass of the Sun, and has an eccentric orbit with a period of about 8,500 days (23 years).[4]
References
- ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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.
- ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
- ↑ 4.0 4.1 4.2 4.3 Lee, Byeong-Cheol et al. (December 2023). "A Search for Exoplanets around Northern Circumpolar Stars. IX. A Multi-Period Analysis of the M Giant HD 135438". Journal of the Korean Astronomical Society 56: 277–286. doi:10.5303/JKAS.2023.56.2.277. Bibcode: 2023JKAS...56..277L. https://koreascience.or.kr/article/JAKO202305443277706.pdf.
- ↑ Pickles, A.; Depagne, É. (2010). "All-Sky Spectrally Matched UBVRI - ZY and u‧ g‧ r‧ i‧ z‧ Magnitudes for Stars in the Tycho2 Catalog". Publications of the Astronomical Society of the Pacific 122 (898): 1437. doi:10.1086/657947. Bibcode: 2010PASP..122.1437P.
- ↑ Percy, John R. (December 1993). "The photometric variability of K giants". Publications of the Astronomical Society of the Pacific 105 (694): 1422–1426. doi:10.1086/133324. Bibcode: 1993PASP..105.1422P.
- ↑ Gontcharov, G. A. (2017). "VizieR Online Data Catalog: Tycho-2 red giant branch and carbon stars (Gontcharov, 2011)". VizieR On-line Data Catalog. Bibcode: 2017yCat..90370769G.
- ↑ "HD 135438". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+135438.
- ↑ Mason, B. D. et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal 122 (6): 3466–3471. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds.
- ↑ 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.
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