99 Herculis

99 Herculis A
Datos d'observación; (Dómina J2000.0)
Constelación	Hércules
Ascensión reuta (α)	18h 07m 01,54s
Declinación (δ)	+30º 33’ 43,7’’
Mag. aparente (V)	+5,20
Carauterístiques físiques
Clasificación estelar	F7V
Masa solar	0,98 M☉
Radiu	(1,1 R☉)
Magnitú absoluta	+4,09
Gravedá superficial	4,24 (log g)
Lluminosidá	2,1 L☉
Temperatura superficial	5918 - 5928 K
Metalicidá	[Fe/H] = -0,55
Periodu de rotación	9,0 díes
Astrometría
Velocidá radial	+1,0 km/s
Distancia	51,0 años lluz (15,6 pc)
Paralax	63,93 ± 0,34 mas
Sistema
Nᵁ de componentes	2
Referencies
SIMBAD	enllaz
NStED	enllaz
Otres designaciones
	b Herculis / HD 165908 / HR 6775 / HIP 88745 / GJ 704 / SAO 66648
	[editar datos en Wikidata]

99 Herculis (99 Her / b Herculis)^[1] ye una estrella binaria na constelación d'Hércules de magnitú aparente +5,07. Alcuéntrase a 51 años lluz de distancia del Sistema Solar.

La estrella primaria de 99 Herculis ye una nana mariella de tipu espectral F7V. Tien una temperatura efectivo de 5918 - 5928 K^[2]^[3] y una lluminosidá llixeramente percima del doble de la lluminosidá solar.^[4] Con un radiu aproximao un 10% más grande que'l del Sol,^[5] el so periodu de rotación ye de 9 díes.^[6] La so masa ye un 2% menor que la del Sol. Tien una metalicidá sensiblemente inferior a la solar, siendo'l conteníu relativo de fierro igual al 28% del reparáu nel Sol ([Fe/H] = -0,55). Esta mesmu enclín reparar nel conteníu d'elementos como sodiu, magnesiu, aluminiu y níquel. Al igual que'l Sol, ye una estrella del discu finu,^[7] que la so edá envalorada ye de 6700 - 6800 millones d'años.^[8]^[9]

La estrella secundaria, muncho menos estudiada, ye una nana naranxa de tipu K4V. De magnitú aparente +8,9, el so radiu ye igual al 74% del radiu solar.^[10] El so periodu orbital ye de 56,40 años y la escentricidá de la órbita ε ye igual a 0,75.^[11]

Referencies[editar | editar la fonte]

↑ 99 Herculis (SIMBAD)
↑ Cenarro, A. J.; Peletier, R. F.; Sánchez-Blázquez, P.; Selam, S. O.; Toloba, E.; Cardiel, N.; Falcón-Barroso, J.; Gorgas, J.; Jiménez-Vicente, J.; Vazdekis, A. (2007). «Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters». Monthly Notices of the Royal Astronomical Society 374 (2). páxs. 664-690. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007MNRAS.374..664C&db_key=AST&nosetcookie=1.
↑ Ramírez, I.; Allende Prieto, C.; Lambert, D. L. (2007). «Oxygen abundances in nearby stars. Clues to the formation and evolution of the Galactic disk». Astronomy and Astrophysics 456 (1). páxs. 271-289. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...465..271R&db_key=AST&nosetcookie=1.
↑ Takeda, Yoichi (2007). «Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database». Publications of the Astronomical Society of Japan 59 (2). páxs. 335-356. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=J/PASJ/59/335/catalog&recno=39.
↑ Gliese 704 A (CADARS)
↑ Wright, J. T.; Marcy, G. W.; Butler, R. Paul; Vogt, S. S. (2004). «Chromospheric Ca II Emission in Nearby F, G, K, and M Stars». The Astrophysical Journal Supplement Series 152 (2). páxs. 261-295. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2004ApJS..152..261W&db_key=AST&nosetcookie=1.
↑ Soubiran, C.; Girard, P. (2005). «Abundance trends in kinematical groups of the Milky Way's disk». Astronomy and Astrophysics 438 (1). páxs. 139-151 (Tabla consultada en CDS). http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...438..139S&db_key=AST&nosetcookie=1.
↑ Takeda, Yoichi (2007). «Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database». Publications of the Astronomical Society of Japan 59 (2). páxs. 335-356. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007PASJ...59..335T&db_key=AST&nosetcookie=1.
↑ Holmberg, J.; Nordström, B.; Andersen, J. (2009). «The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics». Astronomy and Astrophysics 501 (3). páxs. 941-947. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2009A%26A...501..941H&db_key=AST&nosetcookie=1.
↑ Gliese 704 B (CADARS)
↑ Eggleton, P. P.; Tokovinin, A. A. (2008). «A catalogue of multiplicity among bright stellar systems». Monthly Notices of the Royal Astronomical Society 389 (2). páxs. 869-879. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008MNRAS.389..869Y&db_key=AST&nosetcookie=1.

Coordenaes: 18^h 7^m 1.591^s, 30^° 33^′ 43.585^″

[1] 99 Herculis (SIMBAD)

[Cenarro-2] Cenarro, A. J.; Peletier, R. F.; Sánchez-Blázquez, P.; Selam, S. O.; Toloba, E.; Cardiel, N.; Falcón-Barroso, J.; Gorgas, J.; Jiménez-Vicente, J.; Vazdekis, A. (2007). «Medium-resolution Isaac Newton Telescope library of empirical spectra - II. The stellar atmospheric parameters». Monthly Notices of the Royal Astronomical Society 374 (2). páxs. 664-690. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007MNRAS.374..664C&db_key=AST&nosetcookie=1.

[Ramirez-3] Ramírez, I.; Allende Prieto, C.; Lambert, D. L. (2007). «Oxygen abundances in nearby stars. Clues to the formation and evolution of the Galactic disk». Astronomy and Astrophysics 456 (1). páxs. 271-289. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007A%26A...465..271R&db_key=AST&nosetcookie=1.

[Takeda-4] Takeda, Yoichi (2007). «Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database». Publications of the Astronomical Society of Japan 59 (2). páxs. 335-356. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=J/PASJ/59/335/catalog&recno=39.

[5] Gliese 704 A (CADARS)

[Wright-6] Wright, J. T.; Marcy, G. W.; Butler, R. Paul; Vogt, S. S. (2004). «Chromospheric Ca II Emission in Nearby F, G, K, and M Stars». The Astrophysical Journal Supplement Series 152 (2). páxs. 261-295. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2004ApJS..152..261W&db_key=AST&nosetcookie=1.

[Soubiran05-7] Soubiran, C.; Girard, P. (2005). «Abundance trends in kinematical groups of the Milky Way's disk». Astronomy and Astrophysics 438 (1). páxs. 139-151 (Tabla consultada en CDS). http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2005A%26A...438..139S&db_key=AST&nosetcookie=1.

[Takeda2-8] Takeda, Yoichi (2007). «Fundamental Parameters and Elemental Abundances of 160 F-G-K Stars Based on OAO Spectrum Database». Publications of the Astronomical Society of Japan 59 (2). páxs. 335-356. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2007PASJ...59..335T&db_key=AST&nosetcookie=1.

[Geneva2009-9] Holmberg, J.; Nordström, B.; Andersen, J. (2009). «The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics». Astronomy and Astrophysics 501 (3). páxs. 941-947. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2009A%26A...501..941H&db_key=AST&nosetcookie=1.

[10] Gliese 704 B (CADARS)

[Eggleton-11] Eggleton, P. P.; Tokovinin, A. A. (2008). «A catalogue of multiplicity among bright stellar systems». Monthly Notices of the Royal Astronomical Society 389 (2). páxs. 869-879. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008MNRAS.389..869Y&db_key=AST&nosetcookie=1.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]