Výsledky vyhledávání - "J.-P. Sareyan"

Searching for signatures of stochastic excitation in stellar pulsations: a look at γ Doradus stars

Autor: Tiago M. D. Pereira, J. C. Suárez, Pedro J. Amado, A. Arellano Ferro, Ilídio Lopes, V. Costa, A. Rolland, Susana Martín-Ruiz, R. Garrido, J. P. Sareyan, E. Rodríguez

Publikováno v: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação
instacron:RCAAP

In stellar oscillations, the temporal variation in the amplitude of a given mode can yield some information about the interior of the star. In what concerns the excitation mechanism, it has been shown that for oscillations that are excited and damped

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4db8d1e1cdfdf4bb30529c77458d4605
https://doi.org/10.1051/0004-6361:20065355

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Non-radial pulsations in the γ Doradus star HD 195068

Autor: P. Mathias, Slobodan Jankov, J. M. Le Contel, J. P. Sareyan, E. Chapellier

Publikováno v: Astronomy & Astrophysics. 453:1041-1050

We present high resolution spectroscopic observations of the γ Doradus star HD 195068. About 230 spectra were collected over 2 years. Time series analysis performed on radial velocity data shows a main peak at 1.61 d -1 , a frequency not yet detecte

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::db2481ffc75eb31cb27ba998a891d57c
https://doi.org/10.1051/0004-6361:20053117

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HD 173977: An ellipsoidal δ Scuti star variable

Autor: Ignasi Ribas, M. Alvarez, Ph. Mathias, R. Garrido, J. M. Le Contel, Andrés Moya, J. P. Sareyan, E. Chapellier, L. Parrao, J. H. Pena

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2004, 426, pp.247-252. ⟨10.1051/0004-6361:20034068⟩

We present spectroscopic and photometric observations of the star HD 173977. It appears that the star is part of a double line binary system, with a period of 1.801 d, corresponding to twice the period of the photometric variations. Hence the star is

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2cc84268ba87c486e6075f90df77044c
https://doi.org/10.1051/0004-6361:20034068

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δ Sct-type nature of the variable V2109 Cyg

Autor: M. J. Lopez-Gonzalez, E. Rodríguez, J. P. Sareyan, V. Costa, A. Arellano Ferro

Publikováno v: Astronomy & Astrophysics. 407:1059-1065

We present the results of simultaneous uvbyβ photometry carried out from 1999 to 2001 of the variable V2109 Cyg together with a spectroscopic analysis based on one high resolution spectrum obtained in 2000. From this study, the star is definitively

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8dd1c902a1cf58c1360f2b0c5d3acbe4
https://doi.org/10.1051/0004-6361:20030925

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14 Lacertae: A case of shell–orbit coupling?

Autor: G. Guerrero, J.-P. Sareyan, M. Alvarez, M. Bossi, N. S. Nuñez

Publikováno v: Astronomy and Astrophysics Supplement Series. 127:433-444

We present new photometric and spectro- scopic observations of this peculiar Be star: respectively 516 V values in 16 nights and 50 spectrograms in 4 nights in the H region. A feature of the HeI6678 line prole seems to indicate the presence of a doub

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::95303994192a959cf0a73ef51d7d1fbe
https://doi.org/10.1051/aas:1998112

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Monitoring the activity of the Be star OT Geminorum

Autor: A. Arellano Ferro, J. J. Avila, J. P. Sareyan, F. Gonzalez, M. Dumont, Geos

Publikováno v: Astronomy and Astrophysics Supplement Series. 127:455-461

Observations obtained in 1995-1996 of the Be star OT Geminorum are reported and show that in octo- ber 1995 the star reached a very active phase with large variations around a bright plateau, a phase of activity we have also distinguished in previous

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::55b49e32664f7ed96d1d13e0922ec1fa
https://doi.org/10.1051/aas:1998113

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Asteroids' physical models from combined dense and sparse photometry and scaling of the YORP effect by the observed obliquity distribution

Autor: J. Hanuš, J. Ďurech, M. Brož, A. Marciniak, B. D. Warner, F. Pilcher, R. Stephens, R. Behrend, B. Carry, D. Čapek, P. Antonini, M. Audejean, K. Augustesen, E. Barbotin, P. Baudouin, A. Bayol, L. Bernasconi, W. Borczyk, J.-G. Bosch, E. Brochard, L. Brunetto, S. Casulli, A. Cazenave, S. Charbonnel, B. Christophe, F. Colas, J. Coloma, M. Conjat, W. Cooney, H. Correira, V. Cotrez, A. Coupier, R. Crippa, M. Cristofanelli, Ch. Dalmas, C. Danavaro, C. Demeautis, T. Droege, R. Durkee, N. Esseiva, M. Esteban, M. Fagas, G. Farroni, M. Fauvaud, S. Fauvaud, F. Del Freo, L. Garcia, S. Geier, C. Godon, K. Grangeon, H. Hamanowa, N. Heck, S. Hellmich, D. Higgins, R. Hirsch, M. Husarik, T. Itkonen, O. Jade, K. Kamiński, P. Kankiewicz, A. Klotz, R. A. Koff, A. Kryszczyńska, T. Kwiatkowski, A. Laffont, A. Leroy, J. Lecacheux, Y. Leonie, C. Leyrat, F. Manzini, A. Martin, G. Masi, D. Matter, J. Michałowski, M. J. Michałowski, T. Michałowski, J. Michelet, R. Michelsen, E. Morelle, S. Mottola, R. Naves, J. Nomen, J. Oey, W. Ogłoza, A. Oksanen, D. Oszkiewicz, P. Pääkkönen, M. Paiella, H. Pallares, J. Paulo, M. Pavic, B. Payet, M. Polińska, D. Polishook, R. Poncy, Y. Revaz, C. Rinner, M. Rocca, A. Roche, D. Romeuf, R. Roy, H. Saguin, P. A. Salom, S. Sanchez, G. Santacana, T. Santana-Ros, J.-P. Sareyan, K. Sobkowiak, S. Sposetti, D. Starkey, R. Stoss, J. Strajnic, J.-P. Teng, B. Trégon, A. Vagnozzi, F. P. Velichko, N. Waelchli, K. Wagrez, H. Wücher

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, 2013, 551 (A67), 16 p. ⟨10.1051/0004-6361/201220701⟩
Astronomy and Astrophysics-A&A, EDP Sciences, 2013, 551 (A67), 16 p. ⟨10.1051/0004-6361/201220701⟩

The larger number of models of asteroid shapes and their rotational states derived by the lightcurve inversion give us better insight into both the nature of individual objects and the whole asteroid population. With a larger statistical sample we ca

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c4f9941a036a9dd815e01cce509f1298
https://hal.science/hal-00794404

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A Four Star Photometer

Autor: P. Antonelli, P. Michel, J. M. Le Contel, J. C. Valtier, J. P. Sareyan

Publikováno v: International Astronomical Union Colloquium. 136:179-186

A new photometer is presently being developed at the O.C.A. Observatory. It consists of four arms and a CCD camera situated in the focal plane of the telescope. Each arm can move in both directions and support a diaphragm and a liquid optic guide tha

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ea24db7224ee069aebc7023f22bac32f
https://doi.org/10.1017/s0252921100007545

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uvby - B PHOTOELECTRIC PHOTOMETRY OF CEPHEID STARS

Autor: J. H. Peña, A. Arellano Ferro, R. Peña-Miller, M. Álvarez, Y. Rosas, H. García, G. Muñoz, B. Vargas, J. P. Sareyan, C. A. Guerrero, A. Rentería

Publikováno v: Instituto Politécnico Nacional
IPN
Redalyc-IPN
Universidad Nacional Autónoma de México
UNAM
Redalyc-UNAM
Revista Mexicana de Astronomía y Astrofísica (México) Num.2 Vol.46

"We present time-series uvby, photometry of 41 classical Cepheid stars. A brief discussion of a comparison between the present data and previous photometric observations is included."

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::81d9df8b975fe3ff4119804e8202e525
http://www.redalyc.org/articulo.oa?id=57115522008

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