 Sky area of 10 x 10 square arcmin around the 6th-magnitude giant star HD 47536. Reproduced from the Digital Sky Survey. | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Canis Major |
| Right ascension | 06h 37m 47.61811s[1] |
| Declination | −32° 20′ 23.0405″[1] |
| Apparent magnitude (V) | +5.25[2] |
| Characteristics | |
| Evolutionary stage | giant[3] |
| Spectral type | K1 III[4] |
| B−V color index | +1.177±0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | 79.64±0.13[1] km/s |
| Proper motion (μ) | RA: 107.755±0.053 mas/yr[1] Dec.: 65.122±0.059 mas/yr[1] |
| Parallax (π) | 7.9902 ± 0.0535 mas[1] |
| Distance | 408 ± 3 ly (125.2 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.17±0.15[5] |
| Details[5] | |
| Mass | 0.94±0.06 M☉ |
| Radius | 23.08+0.68 −0.81[6] R☉ |
| Luminosity | 177.2±2.3[6] L☉ |
| Surface gravity (log g) | 1.72±0.08 cgs |
| Temperature | 4,384+79 −64[6] K |
| Metallicity [Fe/H] | −0.68 dex |
| Rotation | 625 days[7] |
| Rotational velocity (v sin i) | 1.93±0.50[3] km/s |
| Age | 9.33±1.88 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 47536 is a single[9] star in the southern constellation of Canis Major. It has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.25.[2] The star is located at a distance of approximately 408 light years from the Sun based on parallax. It is drifting further away with a radial velocity of 80 km/s.[1]
This is an aging, metal-poor giant star with a stellar classification of K1 III.[4] It is about 9.3 billion years old with 94% of the mass of the Sun. Having exhausted the supply of hydrogen at its core, the star cooled and expanded to 23 times the Sun's radius.[6] The star is spinning slowly, taking 1.71 years to complete its sidereal rotation. It is radiating 177[6] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,384 K.[6] As of 2015, at least one planet is known to orbit this star.[10]
Planetary system
[edit]A planetary companion to this star, HD 47536 b, was discovered in 2003 by a team led by J. Setiawan.[11][3] A second planet, HD 47536 c, was claimed in 2007.[12] However, a follow-up study by Soto et al. in 2015 failed to detect the signal of the second planet, so it remains unconfirmed.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥4.0±0.4 MJ | 1.12±0.005 | 434.9±2.6 | 0.3±0.1 | — | — |
| c (unconfirmed) | >6.98 MJ | 3.72 | 2500 | — | — | — |
See also
[edit]References
[edit]- ^ 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.
- ^ a b c 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 Setiawan, J.; et al. (2003). "Evidence of a sub-stellar companion around HD 47536". Astronomy and Astrophysics. 398 (2): L19–L23. Bibcode:2003A&A...398L..19S. doi:10.1051/0004-6361:20021846.
- ^ a b Houk, Nancy (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 3. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode:1982mcts.book.....H.
- ^ a b da Silva, L.; et al. (November 2006). "Basic physical parameters of a selected sample of evolved stars". Astronomy and Astrophysics. 458 (2): 609–623. arXiv:astro-ph/0608160. Bibcode:2006A&A...458..609D. doi:10.1051/0004-6361:20065105. S2CID 9341088.
- ^ a b c d e f 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.
- ^ Setiawan, J.; et al. (July 2004). "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch". Astronomy and Astrophysics. 421: 241–254. Bibcode:2004A&A...421..241S. doi:10.1051/0004-6361:20041042-1.
- ^ "HD 47536". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-01-03.
- ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x. S2CID 14878976.
- ^ a b c Soto, M. G.; et al. (August 2015). "RAFT - I. Discovery of new planetary candidates and updated orbits from archival FEROS spectra". Monthly Notices of the Royal Astronomical Society. 451 (3): 3131–3144. arXiv:1505.04796. Bibcode:2015MNRAS.451.3131S. doi:10.1093/mnras/stv1144. S2CID 49332927.
- ^ "Distant World in Peril Discovered from La Silla: Giant Exoplanet Orbits Giant Star". ESO for the Public (Press release). Garching, Germany: European Southern Observatory. 22 January 2003. Retrieved 30 December 2012.
- ^ Setiawan, J.; Weise, P.; Henning, Th.; Hatzes, A. P.; Pasquini, L.; Da Silva, L.; Girardi, L.; von Der Lühe, O.; Döllinger, M. P.; Weiss, A.; Biazzo, K. (2008). "Planets Around Active Stars". Precision Spectroscopy in Astrophysics. ESO Astrophysics Symposia. pp. 201–204. arXiv:0704.2145. doi:10.1007/978-3-540-75485-5_43. ISBN 978-3-540-75484-8. S2CID 116889047.
External links
[edit]
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction