Conferencia
Abstract:
In this work we present Echelle spectra of the dM5.5e flare star Proxima Centauri, obtained in the CASLEO observatory. We have 44 observations from 1999 to date, taken in 11 different observing runs, which were flux calibrated. The index mostly used to measure stellar activity is the one combining Ca II H&K line fluxes. These lines, which are formed in the stellar chromosphere, are not particularly adequate to study cool stars, which are intrinsically faint and red. We construct an index from Hα, which shows a good correlation with the Ca II lines and is more suitable for this cool star, due to its longer wavelength. We found that the He I D3 line can be a useful proxy to discriminate the average chromospheric activity from the frequent flaring activity. We could separate this transient activity using this index, and we found that the remaining variability is compatible with the existence of an activity cycle of around 1300 days as suggested in previous works.
Registro:
| Documento: | Conferencia |
| Título: | Chromospheric activity in proxima centauri |
| Autor: | Cincunegui, C.; Mauas, P.J.D.; Favata F.; Hussain G.A.J.; Battrick B. |
| Ciudad: | Hamburg |
| Filiación: | Instituto de Astronomía y Física del Espacio, CC. 67, Sue. 28, 1428 Buenos Aires, Argentina |
| Palabras clave: | Stars: Activity; Stars: Flare stars; Stars: Individual (Proxima Centauri); Activation analysis; Atmospherics; Correlation methods; Fluxes; Signal to noise ratio; Spectrum analysis; Proxima centauri; Stars: activity; Stars: flare stars; Stars: individual (Proxima Centauri); Astronomy |
| Año: | 2005 |
| Número: | 560 I |
| Página de inicio: | 479 |
| Página de fin: | 482 |
| Título revista: | 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun |
| Título revista abreviado: | Eur Space Agency Spec Publ ESA SP |
| ISSN: | 03796566 |
| CODEN: | ESPUD |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n560I_p479_Cincunegui |
Referencias:
- Baliunas, S.L., Donahue, R.A., Soon, W., Henry, G.W., (1998) ASP Conf. Ser. 154: Cool Stars, Stellar Systems, and the Sun, p. 153
- Benedict, G.F., McArthur, B., Nelan, E., Story, D., Whipple, A.L., Shelus, P.J., Jefferys, W.H., Fredrick, L.W., (1998) AJ, 116, p. 429
- Cincunegui, C., Mauas, P.J.D., (2002) Proceedings of the Second Solar Cycle and Space Weather Euroconference, p. 91. , ESA SP-477: Solspa 2001
- Cincunegui, C., Mauas, P.J.D., (2004) A&A, 414, p. 699
- Guinan, E.F., Morgan, N.D., (1996) Bulletin of the American Astronomical Society, 28, p. 942
Citas:
---------- APA ----------
Cincunegui, C., Mauas, P.J.D., Favata F., Hussain G.A.J. & Battrick B. (2005) . Chromospheric activity in proxima centauri. 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun(560 I), 479-482.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n560I_p479_Cincunegui [ ]
---------- CHICAGO ----------
Cincunegui, C., Mauas, P.J.D., Favata F., Hussain G.A.J., Battrick B. "Chromospheric activity in proxima centauri" . 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, no. 560 I (2005) : 479-482.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n560I_p479_Cincunegui [ ]
---------- MLA ----------
Cincunegui, C., Mauas, P.J.D., Favata F., Hussain G.A.J., Battrick B. "Chromospheric activity in proxima centauri" . 13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, no. 560 I, 2005, pp. 479-482.Recuperado de https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n560I_p479_Cincunegui [ ]
---------- VANCOUVER ----------
Cincunegui, C., Mauas, P.J.D., Favata F., Hussain G.A.J., Battrick B. Chromospheric activity in proxima centauri. Eur Space Agency Spec Publ ESA SP. 2005(560 I):479-482.Available from: https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03796566_v_n560I_p479_Cincunegui [ ]
