Pulsations, chemical composition and multiplicity in main-sequence A- and F-type stars (2009)
Hekker, S., Frémat, Y., Lampens, P., De Cat, P.
The region in the HR-diagram where the main sequence intersects the classical instability strip hosts A- and F-type stars exhibiting a rich variety of physical phenomena, such as pulsations on...
The Gaia satellite: a tool for Emission Line Stars and Hot Stars (2008)
Martayan, C, Frémat, Y, Blomme, R, Jonckheere, A, Borges, M, De Batz, B, ...
The Gaia satellite will be launched at the end of 2011. It will observe at least 1 billion stars, and among them several million emission line stars and hot stars. Gaia will provide parallaxes for...
Multiperiodic pulsations in the Be stars NW Ser and V1446 Aql (2007)
Gutiérrez-Soto, J., Fabregat, J., Suso, J., Suárez, J. C., Moya, A., Garrido, R., ...
Aims: We present accurate photometric time series of two Be stars: NW Ser and V1446 Aql. Both stars were observed at the Observatorio de Sierra Nevada (Granada) in July 2003 with an automatic...
Fundamental Parameters of He-Weak and He-Strong Stars (2007)
Cidale, L. S., Arias, M. L., Torres, A. F., Zorec, J., Frémat, Y., Cruzado, A.
We carried out low resolution spectroscopic observations in the wavelength range 3400-4700 A of 20 He-weak and 8 He-strong stars to determine their fundamental parameters by means of the...
Metallicity vs. Be phenomenon relation in the solar neighborhood (2006)
Levenhagen, R.S., Leister, N.V., Zorec, J., Frémat, Y.
Fast rotation seems to be the mayor factor to trigger the Be phenomenon. Surface fast rotation can be favored by initial formation conditions, such as abundance of metals. We have observed 118 Be...
Circumstellar rings, flat and flaring discs (2006)
Arias, M.L., Zorec, J., Frémat, Y.
Emission lines formed in the circumstellar envelopes of several type of stars can be modeled using first principles of line formation. We present simple ways of calculating line emission profiles...
Differential rotation in early type stars (2006)
Using 2D models of rotating stars, the interferometric measurements of alpha Eri and its fundamental parameters corrected for gravitational darkening effects we infer that the star might have a core...
Rotation in the ZAMS: Be and Bn stars (2006)
Zorec, J., Frémat, Y., Martayan, C., Cidale, L., Torres, A.
We show that Be stars belong to a high velocity tail of a single B-type star rotational velocity distribution in the MS. This implies that: 1) the number fraction N(Be)/N(Be+B) is independent of the...
Metallicity vs. Be phenomenon relation in the solar neighborhood (2006)
Levenhagen, R.S., Leister, N.V., Zorec, J., Frémat, Y.
Fast rotation seems to be the mayor factor to trigger the Be phenomenon. Surface fast rotation can be favored by initial formation conditions, such as abundance of metals. We have observed 118 Be...
Circumstellar rings, flat and flaring discs (2006)
Arias, M.L., Zorec, J., Frémat, Y.
Emission lines formed in the circumstellar envelopes of several type of stars can be modeled using first principles of line formation. We present simple ways of calculating line emission profiles...
Differential rotation in early type stars (2006)
Using 2D models of rotating stars, the interferometric measurements of alpha Eri and its fundamental parameters corrected for gravitational darkening effects we infer that the star might have a core...
Rotation in the ZAMS: Be and Bn stars (2006)
Zorec, J., Frémat, Y., Martayan, C., Cidale, L., Torres, A.
We show that Be stars belong to a high velocity tail of a single B-type star rotational velocity distribution in the MS. This implies that: 1) the number fraction N(Be)/N(Be+B) is independent of the...
Rotation in the ZAMS: Be and Bn stars (2006)
Zorec, J., Frémat, Y., Martayan, C., Cidale, L., Torres, A.
We show that Be stars belong to a high velocity tail of a single B-type star rotational velocity distribution in the MS. This implies that: 1) the number fraction N(Be)/N(Be+B) is independent of the...
Differential rotation in early type stars (2006)
Zorec, J., Frémat, Y., De Souza, A. Domiciano
Using 2D models of rotating stars, the interferometric measurements of alpha Eri and its fundamental parameters corrected for gravitational darkening effects we infer that the star might have a core...
Circumstellar rings, flat and flaring discs (2006)
Arias, M. L., Zorec, J., Frémat, Y.
Emission lines formed in the circumstellar envelopes of several type of stars can be modeled using first principles of line formation. We present simple ways of calculating line emission profiles...
Metallicity vs. Be phenomenon relation in the solar neighborhood (2006)
Levenhagen, R. S., Leister, N. V., Zorec, J., Frémat, Y.
Fast rotation seems to be the mayor factor to trigger the Be phenomenon. Surface fast rotation can be favored by initial formation conditions, such as abundance of metals. We have observed 118 Be...
Metallicity vs. Be phenomenon relation in the solar neighborhood (2006)
Levenhagen, R.S., Leister, N.V., Zorec, J., Frémat, Y.
Fast rotation seems to be the mayor factor to trigger the Be phenomenon. Surface fast rotation can be favored by initial formation conditions, such as abundance of metals. We have observed 118 Be...
Circumstellar rings, flat and flaring discs (2006)
Arias, M.L., Zorec, J., Frémat, Y.
Emission lines formed in the circumstellar envelopes of several type of stars can be modeled using first principles of line formation. We present simple ways of calculating line emission profiles...
Differential rotation in early type stars (2006)
Using 2D models of rotating stars, the interferometric measurements of alpha Eri and its fundamental parameters corrected for gravitational darkening effects we infer that the star might have a core...
Rotation in the ZAMS: Be and Bn stars (2006)
Zorec, J., Frémat, Y., Martayan, C., Cidale, L., Torres, A.
We show that Be stars belong to a high velocity tail of a single B-type star rotational velocity distribution in the MS. This implies that: 1) the number fraction N(Be)/N(Be+B) is independent of the...
Metallicity vs. Be phenomenon relation in the solar neighborhood (2006)
Levenhagen, R.S., Leister, N.V., Zorec, J., Frémat, Y.
Fast rotation seems to be the mayor factor to trigger the Be phenomenon. Surface fast rotation can be favored by initial formation conditions, such as abundance of metals. We have observed 118 Be...
Circumstellar rings, flat and flaring discs (2006)
Arias, M.L., Zorec, J., Frémat, Y.
Emission lines formed in the circumstellar envelopes of several type of stars can be modeled using first principles of line formation. We present simple ways of calculating line emission profiles...
Differential rotation in early type stars (2006)
Using 2D models of rotating stars, the interferometric measurements of alpha Eri and its fundamental parameters corrected for gravitational darkening effects we infer that the star might have a core...
Rotation in the ZAMS: Be and Bn stars (2006)
Zorec, J., Frémat, Y., Martayan, C., Cidale, L., Torres, A.
We show that Be stars belong to a high velocity tail of a single B-type star rotational velocity distribution in the MS. This implies that: 1) the number fraction N(Be)/N(Be+B) is independent of the...
A Photometric Study of the Light Variations of the Triple System DG Leonis (2005)
Lampens, P., Frémat, Y., Garrido, R., Peña, J. H., Parrao, L., Van Cauteren, P., ...
Multi-site and multi-year differential photometry of the triple star DG Leo reveals a complex frequency spectrum that can be modelled as the combination of at least three Delta Scuti type frequencies...
Photometry of the scuti star dg Leo: preliminary re- sults (2004)
Arentoft, T., Frémat, Y., Garrido, R., Lampens, P., Parrao, L., Peña, J. H.
Se ha obtenido fotometra fotoelectrica uvby para el sistema estelar triple DG Leo desde dos diferentes observatorios equipados con instrumentacion semejante. El analisis preliminar de perodos indica...