Results 41 to 50 of about 20,255 (236)

A representative sample of Be stars IV: Infrared Photometry and the Continuum Excess [PDF]

, 2001
We present infra-red (JHK) photometry of 52 isolated Be stars of spectral types O9--B9 and luminosity classes III--V. We describe a new method of reduction, enabling separation of interstellar reddening and circumstellar excess.
Alonso, Bjorkman, Clark, Cramer, Dachs, Dachs, Dougherty, Dougherty, Elias, Gehrz, Hanson, Hanson, Hanuschik, Hirata, Hummel, I. A. Steele, J. Etherton, John M. Porter, Koornneef, Lamers, Lee, Lee Howells, Leggett, Okazaki, Osaki, Owocki, Poeckert, Porter, Porter, Quirrenbach, Rieke, Slettebak, Slettebak, Steele, van Kerkwijk, Wall, Wall, Waters, Waters   +38 more
core   +2 more sources

The use of Planetary Nebulae precursors in the study of Diffuse Interstellar Bands [PDF]

, 2005
We present the first results of a systematic search for Diffuse Interstellar Bands in a carefully selected sample of post-AGB stars observed with high resolution optical spectroscopy.
Garcia-Lario, P., Luna, R., Satorre, M. A.   +2 more
core   +3 more sources

One Relation for All Wavelengths: The Far-ultraviolet to Mid-infrared Milky Way Spectroscopic R(V)-dependent Dust Extinction Relationship

The Astrophysical Journal, 2023
Dust extinction is one of the fundamental measurements of dust grain sizes, compositions, and shapes. Most of the wavelength-dependent variations seen in Milky Way extinction are strongly correlated with the single parameter R ( V ) = A ( V )/ E ( B − V )
Karl D. Gordon, Geoffrey C. Clayton, Marjorie Decleir, E. L. Fitzpatrick, Derck Massa, Karl A. Misselt, Erik J. Tollerud   +6 more
doaj   +1 more source

Dust Around R Coronae Borealis Stars. I. Spitzer/Infrared Spectrograph Observations [PDF]

, 2011
Spitzer/infrared spectrograph (IRS) spectra from 5 to 37 mu m for a complete sample of 31 R Coronae Borealis stars (RCBs) are presented. These spectra are combined with optical and near-infrared photometry of each RCB at maximum light to compile a ...
Garcia-Hernandez, D. Anibal, Lambert, David L., Rao, N. Kameswara   +2 more
core   +1 more source

Analysis of Interstellar Extinction towards the Hypergiant Cyg OB2 No. 12

Open Astronomy, 2016
The Cyg OB2 stellar association hosts an entire zoo of unique objects, and among them – an enigmatic star Cyg OB2 No. 12 (Schulte 12, MT 304). MT 304 is enigmatic not only due to its highest luminosity (according to various estimates, it is one of the ...
Maryeva O. V., Chentsov E. L., Goranskij V. P., Karpov S. V.   +3 more
doaj   +1 more source

SpeX Near-infrared Spectroscopic Extinction Curves in the Milky Way

The Astrophysical Journal, 2022
Interstellar dust extinction curves provide valuable information about dust properties, including the composition and size of the dust grains, and are essential to correct observations for the effects of interstellar dust.
Marjorie Decleir, Karl D. Gordon, Jennifer E. Andrews, Geoffrey C. Clayton, Michael C. Cushing, Karl A. Misselt, Yvonne Pendleton, John Rayner, William D. Vacca, D. C. B. Whittet   +9 more
doaj   +1 more source

Dust accretion and destruction in galaxy groups and clusters [PDF]

, 2010
We examine the dust distribution around a sample of 70,000 low redshift galaxy groups and clusters derived from the Sloan Digital Sky Survey. By correlating spectroscopically identified background quasars with the galaxy groups we obtain the relative ...
Adelman-McCarthy, Annis, Bahcall, Bai, Balogh, Balogh, Balogh, Bogart, Bovy, Boyle, Bregman, Calzetti, Chelouche, Crowl, Dai, Domainko, Draine, Draine, Eke, Finlator, Gerke, Gómez, Heckman, Holwerda, Hopkins, Kay, Lewis, Li, Mathis, McGee, McGee, McNamara, Michael L. Balogh, Montier, Muller, Ménard, O'Donnell, Parker, Pasquali, Pei, Pfrommer, Prevot, Reiprich, Richards, Romani, Rykoff, Schlegel, Schneider, Sean L. McGee, Sheldon, Sheldon, Shen, Spergel, Stickel, Tremonti, Tucker, Vikhlinin, Weingartner, Weinmann, Wilman, Wise, Yang, Yang, Zackrisson, Zibetti, Zwicky   +65 more
core   +3 more sources

Luminosity class of the symbiotic stars 4U1954+319 and ZZ CMi [PDF]

Serbian Astronomical Journal
We performed optical photometry and spectral observations of the symbiotic stars 4U1954+319 and ZZ CMi. For 4U1954+319, using high-resolution spectra, we, measure the equivalent widths of diffuse interstellar bands (DIBs) and estimate the interstellar ...
Zamanov R., Stoyanov K.A., Latev G., Marti J., Takey A., Elhosseiny E.G., Christova M.D., Minev M., Vujčić V., Moyseev M., Marchev V.   +10 more
doaj   +1 more source

Spectroscopy and BVI photometry of the young open cluster NGC 6604 [PDF]

, 2000
BVI photometry (from South Africa Astron. Obs.), Echelle high resolution spectroscopy and AFOSC integral field spectroscopy (from Asiago, Italy) of the young open cluster NGC 6604 are presented. Age, distance, reddening, membership, radial and rotational
Barbon, R., Carraro, G., Munari, U., Tomasella, L., Zwitter, T.   +4 more
core   +2 more sources

Diverse reddening distributions in sight lines for type Ia supernovae

Astronomy & Astrophysics
Context. Accurate cosmological constraints from type Ia supernovae (SNe) require sufficiently accurate corrections for host-galaxy extinction. Modelling these corrections is challenged by the problem of disentangling the SN’s intrinsic colours from host ...
Hallgren Lucas, Wojtak Radosław, Hjorth Jens, Steinhardt Charles L.   +3 more
doaj   +1 more source