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

Characteristics

A light curve for V341 Carinae, plotted from Hipparcos data.^[11]

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. It is part of the Diamond Cluster moving group.

The star has a radial velocity of 20 km/s.^[12] 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.^[13] One theory is that rather than being an accreting protoplanetary disk the star may be an evolved star that is losing material.^[14]^[15]

References

^ ^a ^b 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
^ "V341 Carinae". International Variable Star Index. AAVSO. Retrieved 2020-03-04.
^ 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.
^ ^a ^b 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.
^ 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.
^ ^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.
^ ^a ^b 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.
^ Castilho, B. V. (2000). "Detailed analysis of a sample of Li-rich giants". Astronomy and Astrophysics. 364: 674–682. Bibcode:2000A&A...364..674C.
^ ^a ^b "HD 65750". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-04.
^ "HIP 38834". Archived from the original on 2015-09-26. Retrieved 2019-06-28.
^ "Hipparcos Tools Interactive Data Access". Hipparcos. ESA. Retrieved 8 December 2021.
^ "IC 2220 - The Toby Jug Nebula". Retrieved 2019-06-28.
^ 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.
^ 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.
^ ESO, Garching, Germany (October 14, 2013). "A close look at the Toby Jug Nebula". Astronomy magazine. Retrieved 2019-06-28.{{cite web}}: CS1 maint: multiple names: authors list (link)