S Normae

S Normae
Datos d'observación; (Dómina J2000.0)
Constelación	Norma
Ascensión reuta (α)	16h 18min 51,83s
Declinación (δ)	-57º 53’ 59,2’’
Mag. aparente (V)	+6,45 (media)
Carauterístiques físiques
Clasificación estelar	F9Ib
Masa solar	5,6 M☉
Radiu	(60 - 66 R☉)
Magnitú absoluta	-3,92
Gravedá superficial	2,0 (log g)
Lluminosidá	2880 L☉
Temperatura superficial	5859 K
Metalicidá	[Fe/H] = +0,06
Variabilidá	Cefeida
Periodu d'oscilación	9,7541 díes
Astrometría
Velocidá radial	+4,9 km/s
Distancia	2670 años lluz (820 pc)
Paralax	1,16 ± 0,76 mas
Sistema
Nᵁ de componentes	2
Referencies
SIMBAD	enllaz
Otres designaciones
	HD 146323 / HR 6062 / HIP 79932 / SAO 243586 / CD-57 6342
	[editar datos en Wikidata]

S Normae (S Nor)^[1] ye una estrella variable na constelación de Norma. Alcuéntrase a 820 pársecs (2670 años lluz) del Sistema Solar^[2] y forma parte del cúmulu NGC 6087.^[1]

S Normae ye una variable cefeida que'l so rellumu bazcuya ente magnitú aparente +6,12 y +6,70 a lo llargo d'un periodu de 9,7541 díes. De tipu espectral mediu F9Ib,^[1] la so temperatura efectivo ye de 5859 K.^[2] Relluma con una lluminosidá 2880 vegaes superior a la del Sol. Tien un radiu ente 60 y 66 vegaes más grande que'l radiu solar^[3]^[4] —equivalente a 0,30 UA— y una masa envalorada 5,6 vegaes mayor que la del Sol.^[4] La so edá envalórase en 43,3 millones d'años.^[5] Ye, al igual que les tamién cefeides W Sagittarii o FF Aquilae, una binaria espectroscópica. El so periodu orbital ye de 3584 ± 33 díes.^[3]

S Normae presenta un conteníu metálico ye similar a la solar, siendo si índiz de metalicidá [Fe/H] = +0,06. Tocantes a otros elementos evaluaos, amuesa cierta sobreabundancia de sodiu y lantanu; nel otru estremu, la so bayura relativa de praseodimiu ye menos de la metá de l'atopada nel Sol ([Pr/H] = -0,32).^[2]

Ver tamién

Llista d'estrelles variables

Referencies

1 2 3 V* S Nor -- Classical Cepheid (delta Cep type) (SIMBAD)
1 2 3 Luck, R. E.; Andrievsky, S. M.; Kovtyukh, V. V.; Gieren, W.; Graczyk, D. (2011). «The Distribution of the Elements in the Galactic Disk. II. Azimuthal and Radial Variation in Abundances from Cepheids». The Astronomical Journal 142 (2). 51. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2011AJ....142...51L&db_key=AST&nosetcookie=1.
1 2 Groenewegen, M. A. T. (2008). «Baade-Wesselink distances and the effect of metallicity in classical cepheids». Astronomy and Astrophysics 488 (1). páxs. 25-35. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008A%26A...488...25G&db_key=AST&nosetcookie=1.
1 2 Neilson, Hilding R.; Lester, John B. (2008). «On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation». The Astrophysical Journal 684 (1). páxs. 569-587. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008ApJ...684..569N&db_key=AST&nosetcookie=1.
↑ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). «A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun». Monthly Notices of the Royal Astronomical Society 410 (1). páxs. 190-200. http://adsabs.harvard.edu/cgi-bin/nph-bib_query?2011MNRAS.410..190T&db_key=AST&nosetcookie=1.

[SIMBAD-1] 1 2 3 V* S Nor -- Classical Cepheid (delta Cep type) (SIMBAD)

[Luck_Andrievsky-2] 1 2 3 Luck, R. E.; Andrievsky, S. M.; Kovtyukh, V. V.; Gieren, W.; Graczyk, D. (2011). «The Distribution of the Elements in the Galactic Disk. II. Azimuthal and Radial Variation in Abundances from Cepheids». The Astronomical Journal 142 (2). 51. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2011AJ....142...51L&db_key=AST&nosetcookie=1.

[Groenewegen-3] 1 2 Groenewegen, M. A. T. (2008). «Baade-Wesselink distances and the effect of metallicity in classical cepheids». Astronomy and Astrophysics 488 (1). páxs. 25-35. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008A%26A...488...25G&db_key=AST&nosetcookie=1.

[Nielson-4] 1 2 Neilson, Hilding R.; Lester, John B. (2008). «On the Enhancement of Mass Loss in Cepheids Due to Radial Pulsation». The Astrophysical Journal 684 (1). páxs. 569-587. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008ApJ...684..569N&db_key=AST&nosetcookie=1.

[Tetzlaff-5] Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (2011). «A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun». Monthly Notices of the Royal Astronomical Society 410 (1). páxs. 190-200. http://adsabs.harvard.edu/cgi-bin/nph-bib_query?2011MNRAS.410..190T&db_key=AST&nosetcookie=1.

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