HD 135438
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| 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 mas[2] |
| 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 | |
| BD+32 2561, HD 135438, HIP 74561, HR 5674, SAO 64574[8] | |
| 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.
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]
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]
References
[edit]- ^ 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.
- ^ a b c d e f 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.
- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
- ^ a b c d Lee, Byeong-Cheol; Koo, Jae-Rim; et al. (December 2023). "A Search for Exoplanets around Northern Circumpolar Stars. IX. A Multi-Period Analysis of the M Giant HD 135438" (PDF). Journal of the Korean Astronomical Society. 56: 277–286. Bibcode:2023JKAS...56..277L. doi:10.5303/JKAS.2023.56.2.277.
- ^ 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. arXiv:1011.2020. Bibcode:2010PASP..122.1437P. doi:10.1086/657947. S2CID 54678796.
- ^ Percy, John R. (December 1993). "The photometric variability of K giants". Publications of the Astronomical Society of the Pacific. 105 (694): 1422–1426. Bibcode:1993PASP..105.1422P. doi:10.1086/133324.
- ^ 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. Retrieved 2 April 2025.
- ^ Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". The Astronomical Journal. 122 (6): 3466–3471. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.
- ^ 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.
