Zeta Capricorni

Bayer name	ζ Capricorni
Flamsteed name	34 Capricorni
Cordoba Survey	CD −22 ° 15388
Bright Star Catalog	HR 8204 [1]
Henry Draper Catalog	HD 204075 [2]
Hipparcos catalog	HIP 105881 [3]
SAO catalog	SAO 190341 [4]
Tycho catalog	TYC 6372-1278-1 [5]
2MASS catalog	2MASS 21264003-2224407 [6]
Other names	WDS 21267-2225 CCDM 21267-2225 FK5 806

Zeta Capricorni (ζ Cap) is a spectroscopic double star in the constellation Capricorn . It has an apparent magnitude of 3.9 mag and its distance is approximately 385 light years .

The main star of the system is a yellow giant star with about 6 times the mass and more than 400 times the luminosity of the sun , its surface temperature is about 5200 K. Its companion is a white dwarf . It cannot be observed directly, but is only noticeable through fluctuations in the spectrum of the main star with a period of 6.5 years.

Zeta Capricorni is occasionally referred to as "Marakk" (from Arabic مراقّ البطن, DMG marāqq al-baṭn 'soft parts of the abdomen'). The proper name of the star " Merak " in the constellation Great Bear is derived from the same Arabic term , which should not be confused with Zeta Capricorni because of this similarity of names. ^a

^aNote the importance of "Marakk": In many English-speaking websites, the term loins , thus "loins", stated. By definition, the loin is the deepened area between the lumbar spine, the lower ribs and the hips. But as above is marāqq used in Arabic in conjunction with the word for belly and the correct meaning The soft parts of the belly can be found in the first Persian-Arabic-English dictionary of John Richardson . This corresponds more closely to the anatomical position of the star Zeta Capricorni, if one superimposes the traditional pictorial representation of the constellation.

Scientific research

Zeta Capricorni belongs to the rare group of barium stars among the red giants, which show unusually strong lines of simply ionized barium and other elements in their emission spectrum . Almost all barium stars are components of a binary system where they are orbited by a white dwarf, as is the case here. In a study from 1991, the star was classified in the Ba 2.0 class, making it one of the strong barium stars.

Web links

http://stars.astro.illinois.edu/sow/zetacap.html

Individual evidence

^ ^A ^b ^c VizieR: Hipparcos, the New Reduction (van Leeuwen, 2007) - The Astrometric Catalog
↑ ^a ^b ^c VizieR: Stellar Photometry in Johnson's 11-color system (Ducati, 2002)
^ VizieR: Properties of Sirius-like binary systems (Holberg +, 2013)
↑ VizieR: Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)
↑ ^a ^b VizieR: Infrared excesses of Hipparcos stars (McDonald +, 2012)
↑ VizieR: Mg / Fe ratio of MILES stars (Milone +, 2011)
^ VizieR: Orbits of visual binaries and dynamical masses (Malkov +, 2012)
^ P. Moore, R. Rees: Patrick Moore's Data Book of Astronomy . Cambridge University Press, Cambridge 2011, ISBN 978-0-521-89935-2 , p. 397.
↑ تعريف و معنى مراقّ في معجم المعاني الجامع - معجم عربي عربي. Almaany.com, accessed January 18, 2017 (Arabic, see entry 3.).
↑ J. Richardson, Ch. Wilkins, F. Johnson: A Dictionary, Persian, Arabic, and English; with a Dissertation on the Languages, Literature, and Manners of Eastern Nations. London 1829, p. 1384.
↑ Ph. K. Lu: Taxonomy of Barium Stars. In: The Astronomical Journal. Vol. 101, 1991, doi: 10.1086 / 115845 , pp. 2229-2254 ( bibcode : 1991AJ .... 101.2229L ).

[HIP2-1] A ^b ^c VizieR: Hipparcos, the New Reduction (van Leeuwen, 2007) - The Astrometric Catalog

[II/237-2] VizieR: Stellar Photometry in Johnson's 11-color system (Ducati, 2002)

[435/2077-3] VizieR: Properties of Sirius-like binary systems (Holberg +, 2013)

[4] VizieR: Pulkovo radial velocities for 35493 HIP stars (Gontcharov, 2006)

[427/343-5] VizieR: Infrared excesses of Hipparcos stars (McDonald +, 2012)

[6] VizieR: Mg / Fe ratio of MILES stars (Milone +, 2011)

[7] VizieR: Orbits of visual binaries and dynamical masses (Malkov +, 2012)

[8] P. Moore, R. Rees: Patrick Moore's Data Book of Astronomy . Cambridge University Press, Cambridge 2011, ISBN 978-0-521-89935-2 , p. 397.

[9] تعريف و معنى مراقّ في معجم المعاني الجامع - معجم عربي عربي. Almaany.com, accessed January 18, 2017 (Arabic, see entry 3.).

[10] J. Richardson, Ch. Wilkins, F. Johnson: A Dictionary, Persian, Arabic, and English; with a Dissertation on the Languages, Literature, and Manners of Eastern Nations. London 1829, p. 1384.

[11] Ph. K. Lu: Taxonomy of Barium Stars. In: The Astronomical Journal. Vol. 101, 1991, doi: 10.1086 / 115845 , pp. 2229-2254 ( bibcode : 1991AJ .... 101.2229L ).