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Abstract:

Context. The IUE database provides several UV high and low-resolution spectra of RS CVn-type stars from 1978 to 1996. In particular, many of these stars were monitored continuously during several seasons by IUE. Aims. Our main purpose is to study the short and long-term chromospheric activity of the RS CVn systems most observed by IUE: HD 22 468 (V711 Tau, HR 1099, K1IV+G5V), HD 21 242 (UX Ari, K0IV+G5V), and HD 224 085 (II Peg, K2IV).Methods. We first obtained the Mount Wilson index from the IUE high and low-resolution spectra. Secondly, we used the Lomb-Scargle periodogram to analyse the mean annual index and the amplitude of the rotational modulation of the index. Results. For HD 22 468 (V711 Tau, HR 1099), we find a possible chromospheric cycle with a period of ~18 years and a shorter cycle with a period of ~3 years, which could be associated to a chromospheric "flip-flop" cycle. The data of HD 224 085 (II Peg) also suggest a chromospheric cycle of ~21 years and a flip-flop cycle of ~9 years. Finally, we obtained a possible chromospheric cycle of ~7 years for HD 21 242 (UX Ari).. © 2009 ESO.

Registro:

Documento: Artículo
Título:Long-term chromospheric activity of non-eclipsing RS CVn-type stars
Autor:Buccino, A.P.; Mauas, P.J.D.
Filiación:Instituto de Astronomía y Física Del Espacio (CONICET), Sucursal 28, 1428-Buenos Aires, Argentina
Palabras clave:Stars binaries: spectroscopic; Stars: activity; Ultraviolet: stars; Chromophores; Flip flop circuits; Polyethylene glycols; Rapid solidification; Chromospheric activities; HR 1099; Lomb-scargle periodogram; Resolution spectrum; Rotational modulations; Stars: activity; Ultraviolet: stars; V711 taus; Stars
Año:2009
Volumen:495
Número:1
Página de inicio:287
Página de fin:295
DOI: http://dx.doi.org/10.1051/0004-6361:200810985
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v495_n1_p287_Buccino

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Citas:

---------- APA ----------
Buccino, A.P. & Mauas, P.J.D. (2009) . Long-term chromospheric activity of non-eclipsing RS CVn-type stars. Astronomy and Astrophysics, 495(1), 287-295.
http://dx.doi.org/10.1051/0004-6361:200810985
---------- CHICAGO ----------
Buccino, A.P., Mauas, P.J.D. "Long-term chromospheric activity of non-eclipsing RS CVn-type stars" . Astronomy and Astrophysics 495, no. 1 (2009) : 287-295.
http://dx.doi.org/10.1051/0004-6361:200810985
---------- MLA ----------
Buccino, A.P., Mauas, P.J.D. "Long-term chromospheric activity of non-eclipsing RS CVn-type stars" . Astronomy and Astrophysics, vol. 495, no. 1, 2009, pp. 287-295.
http://dx.doi.org/10.1051/0004-6361:200810985
---------- VANCOUVER ----------
Buccino, A.P., Mauas, P.J.D. Long-term chromospheric activity of non-eclipsing RS CVn-type stars. Astron. Astrophys. 2009;495(1):287-295.
http://dx.doi.org/10.1051/0004-6361:200810985