HD 130144
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h 46m 05.94566s[1] |
| Declination | +15° 07′ 54.4332″[1] |
| Apparent magnitude (V) | 5.82[2] |
| Characteristics | |
| Spectral type | M5III[3] |
| U−B color index | +1.26[2] |
| B−V color index | +1.50[2] |
| Variable type | Lb[4] |
| Astrometry | |
| Radial velocity (Rv) | −22.52±0.65[5] km/s |
| Proper motion (μ) | RA: −85.49[1] mas/yr Dec.: +18.86[1] mas/yr |
| Parallax (π) | 4.04 ± 0.38[1] mas |
| Distance | 810 ± 80 ly (250 ± 20 pc) |
| Details | |
| Radius | 210±21[3] R☉ |
| Luminosity | 5,587[6] L☉ |
| Temperature | 3,333[6] K |
| Rotational velocity (v sin i) | 11[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 130144 (or EK Boötis) is a semiregular variable star in the northern constellation of Boötes. The variation in luminosity has an amplitude of 0.38 in magnitude with no apparent periodicity. This is an X-ray source, and was possibly the first M-type giant star to have a magnetic field directly detected. It is considered to be a single star,[3] although there is nearby companion at an angular separation of 0.2023″ along a position angle of 82.2° (as of 2010.4812).[7]
References
- 1 2 3 4 5 van Leeuwen, F. (November 2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752
, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357 - 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data. SIMBAD, Bibcode:1986EgUBV........0M
- 1 2 3 4 Konstantinova-Antova, R.; Aurière, M.; Charbonnel, C.; Drake, N. A.; Schröder, K.-P.; Stateva, I.; Alecian, E.; Petit, P.; Cabanac, R. (December 2010), "Direct detection of a magnetic field in the photosphere of the single M giant EK Bootis. How common is magnetic activity among M giants?", Astronomy and Astrophysics, 524: 9, arXiv:1009.2001, Bibcode:2010A&A...524A..57K, doi:10.1051/0004-6361/201014503, A57
- ↑ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ↑ Famaey, B.; et al. (2009), "Spectroscopic binaries among Hipparcos M giants,. I. Data, orbits, and intrinsic variations", Astronomy and Astrophysics, 498 (2): 627–640, arXiv:0901.0934, Bibcode:2009A&A...498..627F, doi:10.1051/0004-6361/200810698
- 1 2 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): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
- ↑ Horch, Elliott P.; et al. (February 2011), "Observations of Binary Stars with the Differential Speckle Survey Instrument. II. Hipparcos Stars Observed in 2010 January and June", The Astronomical Journal, 141 (2): 13, Bibcode:2011AJ....141...45H, doi:10.1088/0004-6256/141/2/45, 45
External links
This article is issued from Wikipedia - version of the 4/20/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.