Results 51 to 60 of about 1,478 (224)

On the Circumstellar Matter Distribution around Herbig Ae/Be Stars

The Astrophysical Journal, 1997
The spectral energy distributions (SEDs) observed in Herbig Ae/Be stars are critically analyzed in connection with a spherically symmetric model for matter distribution around the central objects. The possibility that the dusty component is described by an MRN-DL mixture (see the work of Mathis, Rumpl, and Nordsiek; Draine and Lee) and is constituted ...
PEZZUTO S., STRAFELLA, Francesco, LORENZETTI D.   +2 more
openaire   +2 more sources

Mapping Circumstellar Matter with Polarized Light: The Case of Supernova 2014J in M82 [PDF]

, 2018
Optical polarimetry is an effective way of probing the environment of a supernova for dust. We acquired linear HST ACS/WFC polarimetry in bands F W 475 , F606W, and F775W of the supernova (SN) 2014J in M82 at six epochs from ∼277 days to ∼1181 days ...
Cikota, A., Peter A. Höflich, Hoflich, P.A., Aleksandar Cikota, Spyromilio, J., Cracraft, M., Justyn R. Maund, Wang, L., Sparks, W.B., Patat, F., Wheeler, J.C., Dietrich Baade, Jason Spyromilio, Lifan Wang, Wang, X., Misty Cracraft, Brown, P.J., Maund, J.R., Stevance, H.F., William B. Sparks, Yang, Y., Xiaofeng Wang, Yi Yang, Ferdinando Patat, Heloise F. Stevance, Baade, D., J. Craig Wheeler, Peter. J. Brown   +27 more
core   +1 more source

Evolutionary Aspects of Circumstellar Matter in Binary Systems [PDF]

Symposium - International Astronomical Union, 1973
Several groups of close binary stars are considered in an attempt to explain their present state as a consequence of a large-scale mass transfer or mass loss in the past: Algol-like semidetached binaries, some shell stars (AX Mon), some binary X-ray sources (Cen X-3, Her X-1), the recurrent nova T CrB, helium-rich binaries v Sgr and KS Per, and the ...
openaire   +1 more source

Ion‐Scale Characteristics of the Martian Magnetic Pile‐Up Boundary Layer

Geophysical Research Letters, Volume 52, Issue 3, 16 February 2025.
Abstract The Martian magnetic pile‐up boundary (MPB) delineates the interface between the magnetosheath and the induced magnetosphere, but its global ion‐scale characteristics remaining unclear. Utilizing a three‐dimensional Hall magnetohydrodynamic (MHD) model, this study aims to reveal the features of the MPB layer, including magnetic field, current ...
Shibang Li, Siqi Wang, Haoyu Lu, Jinbin Cao, Xiaoshu Wu, Yasong Ge, James A. Wild, Chuanfei Dong, Nihan Chen, Yihui Song, Jianxuan Wang, Yuchen Cao, Jianing Zhao   +12 more
wiley   +1 more source

The delay of shock breakout due to circumstellar material evident in most type II supernovae [PDF]

, 2018
International audienceType II supernovae (SNe II) originate from the explosion of hydrogen-rich supergiant massive stars. Their first electromagnetic signature is the shock breakout (SBO), a short-lived phenomenon that can last for hours to days ...
Estévez, P., Huentelemu, P., Clocchiatti, A, Maureira, JC, Cabrera Vives, G., Vivas, A.K., Fraser, Morgan, Estévez, P. A., Olivares E., F., Vivas, A., Olivares E, F, Reyes, I, Fraser, M, Pignata, Giuliano, Martín, J. San, Jaeger, T., Ashall, Chris, Walton, N.A., Walton, N., de Ugarte Postigo, Antonio de, Huentelemu, P, Gonzalez-Gaitan, S, Förster, F., Maureira, J. C., Graefener, G, de Postigo, A., Gal-Yam, Avishay, Smith, RC, Walton, NA, Yoon, S. -C., De Ugarte Postigo, A., de Jaeger, T., Anderson, J., Huijse, P., Estevez, PA, Gal-Yam, A, Bufano, F, Vera, E., Postigo, A. D., de Jaeger, T, Bufano, F., Anderson, J.P., Ashall, C, Hsiao, E. Y., Medina, G, Mazzali, PA, Razza, A., Maureira, J., Pignata, G, Anderson, JP, Yoon, S.-C., Maureira, J.C., Yoon, S., Vivas, A. K., Medina, G., Mazzali, Paolo A., Gal-Yam, A., Martínez, J., Pignata, G., Smith, R.C., Vera, E, Hamuy, M, Reyes, I., E., F., Hsiao, E.Y., Martín, J., González-Gaitán, Santiago, Mazzali, P.A., Huijse, P, Mazzali, P. A., Young, D.R., Le Guillou, L., Mazzali, P., Yoon, S-C, Anderson, Joseph P., Galbany, Lluís, González -Gaitán, S., Kankare, E, Clocchiatti, A., Ashall, C., Moriya, T. J., San Martín, J., Kuncarayakti, H, González-Gaitán, S., BUFANO, FILOMENA, Olivares, F., Yoon, S. C., Walton, N. A., Förster, Francisco, Fraser, M., Hsiao, E., Smith, R. C., Guillou, L. Le, Estévez, P.A., Kuncarayakti, H., Martinez, J, Smith, R., Young, D., Le Guillou, L, Galbany, L., Moriya, T., Forster, F, de Ugarte Postigo, A, Clocchiatti, Alejandro, Young, D. R., Gräfener, G., Young, DR, Cabrera-Vives, G, Galbany, L, Blinnikov, S., Anderson, J. P., Kuncarayakti, Hanindyo, Razza, A, San Martin, J, Hamuy, M., Blinnikov, S, Cabrera-Vives, G., Moriya, T.J., Vivas, AK, Moriya, TJ, Le Guillou, Laurent, Kankare, E., Hsiao, EY   +122 more
core   +1 more source

The Presolar Grain Database. I. Silicon Carbide

The Astrophysical Journal Supplement Series
The Presolar Grain Database (PGD) contains the vast majority of isotope data (published and unpublished) on presolar grains and was first released as a collection of spreadsheets in 2009.
Thomas Stephan, Reto Trappitsch, Peter Hoppe, Andrew M. Davis, Maitrayee Bose, Asmaa Boujibar, Frank Gyngard, K. Mairin Hynes, Nan Liu, Larry R. Nittler, Ryan C. Ogliore   +10 more
doaj   +1 more source

Fifteen years of “Sonderforschungsbereich” in Heidelberg: Research on circumstellar matter [PDF]

Symposium - International Astronomical Union, 1987
At the end of this year, the Sonderforschungsbereich (Special Collaborative Programme) no. 132 on “Theoretical and Observational Stellar Astronomy” in Heidelberg will terminate after fifteen years. Although 15 years are only 2 1/2 per cent of the age of the University of Heidelberg, which is celebrating its 600 th anniversary this year, they are ...
openaire   +1 more source

SEARCHING FOR LIGHT ECHOES DUE TO CIRCUMSTELLAR MATTER IN SNe Ia SPECTRA [PDF]

The Astrophysical Journal, 2015
We present an analytical model for light echoes (LEs) coming from circumstellar material (CSM) around Type Ia Supernovae (SNe Ia). Using this model we find two spectral signatures at 4100 ? and 6200 ? that are useful to identify LEs during the Lira law phase (between 35 and 80 days after maximum light) coming from nearby CSM at distances of 0.01?0.25 ...
Sebastián Marino, Santiago González-Gaitán, Francisco Förster, Gastón Folatelli, Mario Hamuy, Eric Hsiao   +5 more
openaire   +8 more sources

JWST Imaging of the Closest Globular Clusters—V. The White Dwarfs Cooling Sequence of M4

Astronomische Nachrichten, Volume 346, Issue 2, February 2025.
ABSTRACT We combine infrared (IR) observations collected by the James Webb Space Telescope with optical deep images by the Hubble Space Telescope taken ~20 years earlier to compute proper‐motion membership for the globular cluster (GC) M4 (NGC 6121) along its entire white dwarf (WD) cooling sequence (CS).
Luigi R. Bedin, Mattia Libralato, Maurizio Salaris, Domenico Nardiello, Michele Scalco, Massimo Griggio, Jay Anderson, Pierre Bergeron, Andrea Bellini, Roman Gerasimov, Adam J. Burgasser, Daniel Apai   +11 more
wiley   +1 more source

XMM‐Newton Observations of the Peculiar Be X‐Ray Binary A0538‐66

Astronomische Nachrichten, Volume 346, Issue 1, January 2025.
ABSTRACT A0538‐66 is a neutron star/Be x‐ray binary located in the Large Magellanic Cloud and, since its discovery in the 70s, it showed a peculiar behavior that makes it a unique object in the high‐mass x‐ray binaries scene: the extremely eccentric orbit (e=0.72$$ e=0.72 $$), the short spin period of the neutron star (P=69$$ P=69 $$ ms), the episodes ...
Michela Rigoselli, Caterina Tresoldi, Lorenzo Ducci, Sandro Mereghetti   +3 more
wiley   +1 more source