- HD 12039
-
HD 12039 Observation data
Epoch J2000 Equinox J2000Constellation Cetus Right ascension 01h 57m 48.9777s[1] Declination −21° 54′ 05.347″[1] Apparent magnitude (V) 8.086[2] Characteristics Spectral type G3-5 V[3] Variable type BY Draconis Astrometry Radial velocity (Rv) +5.7 ± 0.3[4] km/s Proper motion (μ) RA: 103.86[1] mas/yr
Dec.: −50.89[1] mas/yrParallax (π) 23.61 ± 1.03[1] mas Distance 138 ± 6 ly
(42 ± 2 pc)Absolute magnitude (MV) 5.03[2] Details Luminosity 0.89[3] L☉ Temperature 5,585[2] K Metallicity ![\begin{smallmatrix}\left[ \frac{Fe}{H} \right]\ =\ -0.28\end{smallmatrix}](1/9a1dc4bb3c8674347ba361c53269cba4.png)
[2]Rotational velocity (v sin i) 17 [5] km/s Age 7.5−8 × 106[3] years Other designations HD 12039 is a variable star in the constellation of Cetus. It is categorized as a BY Draconis variable,[6] and has a stellar classification that is similar to our own Sun.
Recently a debris field was discovered in orbit around this star using infrared observations by the Spitzer telescope. This debris is thought to be an asteroid belt. The measured temperature of the debris is 110°K, which places it in an orbit between 4 and 6 AU from the star, or about the same distance where Jupiter orbits our Sun.[7] This debris disk may have been created by the breakup of a single, 100 km diameter planetesimal through a collision.[8] The star system does not show any excess emission at 70 μm, indicating it does not have a cold outer dust disk.[9]
The star was examined for the presence of an extrasolar planet with a mass in the range 2-10 Jupiter masses and an orbital distance of 3-15.5 AU. Instead, a close stellar companion was likely discovered. This object is separated from the primary by 0.15 arcseconds, making it unlikely to be a background object.[10]
This star has been proposed as a member of the Tucana-Horoglium Association (T-WA), a stream of young stars with a common motion through space. The T-WA association is about 30 million years old.[11][12] However, this star has an estimated age of only 7.5−8 million years.[5] The space velocity components of this star are U = −0.6, V = −16.3 and W = 5.0 km/s.[5] It is orbiting the Milky Way galaxy with an orbital eccentricity of 0.06, with a distance that varies from 7.11−8.01 kpc of the galactic core. The inclination of its orbit carries it as far as 90 parsecs above the galactic plane.[2]
References
- ^ a b c d e Perryman, M. A. C. et al. (1997), "The Hipparcos Catalogue", Astronomy & Astrophysics 323: L49–L52, Bibcode 1997A&A...323L..49P
- ^ a b c d e
- Holmberg, J.; Nordstrom, B.; Andersen, J. (July 2009). "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics". Astronomy and Astrophysics 501 (3): 941−947. Bibcode 2009A&A...501..941H. doi:10.1051/0004-6361/200811191.
- "Detailed Description of V/130". VizieR catalogue service. Centre de Données astronomiques de Strasbourg. http://cdsarc.u-strasbg.fr/viz-bin/Cat?V/130. Retrieved 2009-09-07.
- ^ a b c Roccatagliata, V.; et al. (April 2009). "Long-wavelength observations of debris discs around sun-like stars". Astronomy and Astrophysics 497 (2): 409−421. Bibcode 2009A&A...497..409R. doi:10.1051/0004-6361/200811018.
- ^ Nordström, B.; et al. (2004). "The Geneva-Copenhagen Survey of the Solar Neighbourhood". Publications of the Astronomical Society of Australia 21 (2): 129−133. Bibcode 2004PASA...21..129N. doi:10.1071/AS04013.
- ^ a b c Wichmann, R.; Schmitt, J. H. M. M.; Hubrig, S. (March 2003). "Nearby young stars". Astronomy and Astrophysics 399: 983−994. Bibcode 2003A&A...399..983W. doi:10.1051/0004-6361:20021867. http://www.aanda.org/articles/aa/full/2003/09/aa3158/aa3158.html.
- ^ Kazarovets, A.V. et al. (1999). "The 74th Special Name-list of Variable Stars". Information Bulletin on Variable Stars 4659: 1. Bibcode 1999IBVS.4659....1K. http://www.konkoly.hu/cgi-bin/IBVS?4659.
- ^ Hines, Dean C. et al. (2006-02-20). "The Formation and Evolution of Planetary Systems (FEPS): Discovery of an Unusual Debris System Associated with HD 12039". The Astrophysical Journal 638: 1070−1079. arXiv:astro-ph/0510294. Bibcode 2006ApJ...638.1070H. doi:10.1086/498929. http://iopscience.iop.org/0004-637X/638/2/1070/fulltext.
- ^ Greaves, Jane; Fraser, Helen; Lisse, Casey; Wyatt, Mark (May 2007). "The composition of debris around HD 12039: water from asteroids?". Spitzer Proposal ID #40310. http://adsabs.harvard.edu/abs/2007sptz.prop40310G. Retrieved 2009-09-07.
- ^ Klahr, Hubert; Brandner, Wolfgang (2006). Planet formation: theory, observations and experiments. Cambridge University Press. p. 28. ISBN 0521860156.
- ^ Biller, Beth A. et al. (November 2007). "An Imaging Survey for Extrasolar Planets around 45 Close, Young Stars with the Simultaneous Differential Imager at the Very Large Telescope and MMT". The Astrophysical Journal Supplement Series 173 (1): 143–165. Bibcode 2007ApJS..173..143B. doi:10.1086/519925. http://iopscience.iop.org/0067-0049/173/1/143/fulltext.
- ^ Zuckerman, B.; Song, Inseok (2004). "Young Stars Near the Sun". Annual Review of Astronomy & Astrophysics 42 (1): 685−721. Bibcode 2004ARA&A..42..685Z. doi:10.1146/annurev.astro.42.053102.134111.
- ^ Makarov, Valeri V. (March 2007). "Unraveling the Origins of Nearby Young Stars". The Astrophysical Journal Supplement Series 169 (1): 105−119. Bibcode 2007ApJS..169..105M. doi:10.1086/509887. http://iopscience.iop.org/0067-0049/169/1/105/fulltext.
See also
- "Spitzer Team Says Debris Disk Could Be Forming Infant Terrestrial Planets". Jet Propulsion Laboratory/Space Science Institute. December 14, 2005. http://www.spitzer.caltech.edu/news/779-feature05-27-Spitzer-Team-Says-Debris-Disk-Could-Be-Forming-Infant-Terrestrial-Planets. Retrieved 2011-01-24.
Categories:- Cetus constellation
- G-type main sequence stars
- BY Draconis variables
- Circumstellar discs
Wikimedia Foundation. 2010.