HD 65750

Last updated
HD 65750
Toby Jug Nebula.jpg
The nebula surrounding HD 65750
Observation data
Epoch J2000        Equinox J2000
Constellation Carina
Right ascension 07h 56m 50.94795s [1]
Declination −59° 07′ 32.7605″ [1]
Apparent magnitude  (V)6.2 - 7.1 [2]
Characteristics
Spectral type M1 II [3]
U−B color index +2.18 [4]
B−V color index +1.93 [4]
Variable type LB [5]
Astrometry
Radial velocity (Rv)23.17 km/s
Proper motion (μ)RA: -4.030 [6] mas/yr
Dec.: 9.789 [6] mas/yr
Parallax (π)2.6230±0.0931  mas [6]
Distance 1,240 ± 40  ly
(380 ± 10  pc)
Details
Mass 1.11 [7]   M☉
Radius 103 [6]   R☉
Luminosity 1,698 [6]   L☉
Surface gravity (log g)0.31 [7]   cgs
Temperature 3,650 [6]   K
Metallicity [Fe/H]-0.4 [8]   dex
Other designations
V341  Car, CD-58°1926, HD  65750, HIP  38834, SAO  235638, HR  3126 [9]
Database references
SIMBAD data

HD 65750, also known as V341 Carinae is a bright red giant star in the constellation Carina. It is surrounded by a prominent reflection nebula, [10] [9] known as IC 2220, nicknamed the Toby Jug Nebula.

Contents

Characteristics

A light curve for V341 Carinae, plotted from Hipparcos data. V341CarLightCurve.png
A light curve for V341 Carinae, plotted from Hipparcos data.

Olin Jeuck Eggen and Norman Roy Stokes announced their discovery that the star's brightness varies, in 1970. [12] It was given its variable star designation, V341 Carinae, in 1975. [13] HD 65750 is located about 900 light years away, and has an apparent magnitude that varies between 6.2 and 7.1 and a metallicity just 40% of the Sun. When it is at its brightest, it is very faintly visible to the naked eye of a person with excellent observing conditions. It is part of the Diamond Cluster moving group.

The star has a radial velocity of 20  km/s . [14] The star has a radius over 100 times wider than the Sun's; were it to replace the Sun, HD 65750 would extend past the orbit of Mercury.

Nebulae

The nebulae is a mystery as the variations in nebulae brightness appear to be unrelated to the host star. [15] One theory is that rather than being an accreting protoplanetary disk the star may be an evolved star that is losing material. [16] [17]

References

  1. 1 2 van Leeuwen, F. (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. S2CID   18759600. Vizier catalog entry
  2. ↑ "V341 Carinae". International Variable Star Index. AAVSO . Retrieved 2020-03-04.
  3. ↑ Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins Catalog of Revised MK Types for the Cooler Stars". The Astrophysical Journal Supplement Series. 71: 245. Bibcode:1989ApJS...71..245K. doi:10.1086/191373.
  4. 1 2 Dachs, J. (2000). "On the photometric variations of the red giant HD 65750 and of the surrounding reflection nebula IC 2220". Astronomy and Astrophysics. 63 (3): 353–362. Bibcode:1978A&A....63..353D.
  5. ↑ 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: B/gcvs. Bibcode:2009yCat....102025S.
  6. 1 2 3 4 5 6 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.
  7. 1 2 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevič, G.; Monari, G.; Cantat-Gaudin, T.; Weiler, M.; Khan, S.; Miglio, A.; Carrillo, I.; Romero-Gómez, M.; Minchev, I.; De Jong, R. S.; Antoja, T.; Ramos, P.; Steinmetz, M.; Enke, H. (2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv: 1904.11302 . Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. S2CID   131780028.
  8. ↑ Castilho, B. V. (2000). "Detailed analysis of a sample of Li-rich giants". Astronomy and Astrophysics. 364: 674–682. Bibcode:2000A&A...364..674C.
  9. 1 2 "HD 65750". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-03-04.
  10. ↑ "HIP 38834". Archived from the original on 2015-09-26. Retrieved 2019-06-28.
  11. ↑ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
  12. ↑ Eggen, O. J.; Stokes, N. R. (July 1970). "Narrow-Band and Broad-Band Photometry of Red Stars. III. Southern Giants". Astrophysical Journal. 161: 199–216. Bibcode:1970ApJ...161..199E. doi:10.1086/150525.
  13. ↑ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (January 1975). "60th Name-List of Variable Stars". Information Bulletin on Variable Stars. 961: 1. Bibcode:1975IBVS..961....1K.
  14. ↑ "IC 2220 - The Toby Jug Nebula" . Retrieved 2019-06-28.
  15. ↑ Dachs, J.; Isserstedt, J.; Rahe, J. (1978). "On the photometric variations of the red giant HD 65750 and of the surrounding reflection nebula IC 2220". Astronomy and Astrophysics. 63: 353. Bibcode:1978A&A....63..353D.
  16. ↑ Humphreys, R. M.; Ney, E. P. (1974). "Infrared observations of HD 65750, a red giant in a reflection nebula". Astronomy and Astrophysics. 30: 159. Bibcode:1974A&A....30..159H.
  17. ↑ ESO, Garching, Germany (October 14, 2013). "A close look at the Toby Jug Nebula". Astronomy magazine. Retrieved 2019-06-28.
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