Mid-infrared circumstellar emission of the long-period Cepheid l Carinae resolved with VLTI/MATISSE

Autor: Hocdé, V., Nardetto, N., Matter, A., Lagadec, E., Mérand, A., Cruzalèbes, P., Meilland, A., Millour, F., Lopez, B., Berio, P., Weigelt, G., Petrov, R., Isbell, J. W., Jaffe, W., Kervella, P., Glindemann, A., Schöller, M., Allouche, F., Gallenne, A., de Souza, A. Domiciano, Niccolini, G., Kokoulina, E., Varga, J., Lagarde, S., Augereau, J. -C., van Boekel, R., Bristow, P., Henning, Th., Hofmann, K. -H., Zins, G., Danchi, W. -C., Delbo, M., Dominik, C., Rosas, V. Gámez, Klarmann, L., Hron, J., Hogerheijde, M. R., Meisenheimer, K., Pantin, E., Paladini, C., Robbe-Dubois, S., Schertl, D., Stee, P., Waters, R., Lehmitz, M., Bettonvil, F., Heininger, M., Woillez, J., Wolf, S., Yoffe, G., Szabados, L., Chiavassa, A., Borgniet, S., Breuval, L., Javanmardi, B., Ábrahám, P., Abadie, S., Abuter, R., Accardo, M., Adler, T., Agócs, T., Alonso, J., Antonelli, P., Böhm, A., Bailet, C., Bazin, G., Beckmann, U., Beltran, J., Boland, W., Bourget, P., Brast, R., Bresson, Y., Burtscher, L., Buter, R., Castillo, R., Chelli, A., Cid, C., Clausse, J. -M., Connot, C., Conzelmann, R. D., De Haan, M., Ebert, M., Elswijk, E., Fantei, Y., Frahm, R., Gabasch, A., Garces, E., Girard, P., Glazenborg, A., Gonté, F. Y. J., Herrera, J. C. González, Graser, U., Guajardo, P., Guitton, F., Hanenburg, H., Haubois, X., Hubin, N., Huerta, R., Idserda, J., Ives, D., Jakob, G., Jaskó, A., Jochum, L., Klein, R., Kragt, J., Kroes, G., Kuindersma, S., Labadie, L., Laun, W., Poole, R. Le, Leinert, C., Lizon, J. -L., Lopez, M., Marcotto, A., Mauclert, N., Maurer, T., Mehrgan, L. H., Meisner, J., Meixner, K., Mellein, M., Mohr, L., Morel, S., Mosoni, L., Navarro, R., Neumann, U., Nußbaum, E., Pallanca, L., Pasquini, L., Percheron, I., Duc, T. Phan, Pott, J. -U., Pozna, E., Ridinger, A., Rigal, F., Riquelme, M., Rivinius, Th., Roelfsema, R., Rohloff, R. -R., Rousseau, S., Schuhler, N., Schuil, M., Shabun, K., Soulain, A., Stephan, C., ter Horst, R., Tromp, N., Vakili, F., van Duin, A., Venema, L. B., Vinther, J., Wittkowski, M., Wrhel, F.

The nature of circumstellar envelopes (CSE) around Cepheids is still a matter of debate. The physical origin of their infrared (IR) excess could be either a shell of ionized gas, or a dust envelope, or both. This study aims at constraining the geomet

Externí odkaz: http://arxiv.org/abs/2103.17014

A thin shell of ionized gas explaining the IR excess of classical Cepheids

Autor: Hocdé, V., Nardetto, N., Lagadec, E., Niccolini, G., de Souza, A. Domiciano, Mérand, A., Kervella, P., Gallenne, A., Marengo, M., Trahin, B., Gieren, W., Pietrzynski, G., Borgniet, S., Breuval, L., Javanmardi, B.

Despite observational evidences, InfraRed (IR) excess of classical Cepheids are seldom studied and poorly understood, but probably induces systematics on the Period-Luminosity (PL) relation used in the calibration of the extragalactic distance scale.

Externí odkaz: http://arxiv.org/abs/1909.12376

DGSAT: Dwarf Galaxy Survey with Amateur Telescopes II. A catalogue of isolated nearby edge-on disk galaxies and the discovery of new low surface brightness systems

Autor: Henkel, C., Javanmardi, B., Martinez-Delgado, D., Kroupa, P., Teuwen, R.

Publikováno v: A&A 603, A18 (2017)

The connection between the bulge mass or bulge luminosity in disk galaxies and the number, spatial and phase space distribution of associated dwarf galaxies is a discriminator between cosmological simulations related to galaxy formation in cold dark

Externí odkaz: http://arxiv.org/abs/1703.05356

Peak-peak correlations in the cosmic background radiation from cosmic strings

Autor: Movahed, M. Sadegh, Javanmardi, B., Sheth, Ravi K.

We examine the two-point correlation function of local maxima in temperature fluctuations at the last scattering surface when this stochastic field is modified by the additional fluctuations produced by straight cosmic strings via the Kaiser-Stebbins

Externí odkaz: http://arxiv.org/abs/1212.0964

Pulsating chromosphere of classical Cepheids. Calcium infrared triplet and H$��$ profile variations

Autor: Hocd��, V., Nardetto, N., Borgniet, S., Lagadec, E., Kervella, P., M��rand, A., Evans, N., Gillet, D., Mathias, Ph., Chiavassa, A., Gallenne, A., Breuval, L., Javanmardi, B.

It has been shown recently that the infrared emission of Cepheids, which is constant over the pulsation cycle, might be due to a pulsating shell of ionized gas of about 15\% of the stellar radius, which could be attributed to the chromospheric activi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::75d032c993bc831c9a8c42637cc09e5c