Zobrazeno 1 - 10
of 69
pro vyhledávání: '"M. M. De Robertis"'
Autor:
M. M. De Robertis, C. J. Ryan
Publikováno v:
The Astrophysical Journal. 710:783-796
Gravitational interactions between galaxies are widely believed to be the principal mechanism responsible for triggering non-thermal activity in galactic nuclei. We investigate the connection between interacting galaxies and active galactic nuclei (A
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e6e225f85f5effb709dc239e193343a7
https://doi.org/10.1088/0004-637x/710/1/783
https://doi.org/10.1088/0004-637x/710/1/783
Publikováno v:
The Astrophysical Journal. 654:799-813
(abridged) It has been suggested that Narrow-Line Seyfert 1 (NLS1) galaxies are evolutionarily young objects, powered by the accretion of gas onto central black holes that are lower in mass than those found in typical broad-line Seyferts. We explore
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1dbf779c5bf4e3e245ba35adce2ab0e6
https://doi.org/10.1086/509313
https://doi.org/10.1086/509313
Based on a carefully constructed sample of dwarf stars, a new optical-near infrared photometric calibration to estimate the metallicity of late-type K and early-to-mid-type M dwarfs is presented. The calibration sample has two parts; the first part i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f23186841dbb91ba867fce1245f579c9
http://arxiv.org/abs/1502.07460
http://arxiv.org/abs/1502.07460
Publikováno v:
Astronomy & Astrophysics. 438:957-962
We present a review of the current knowledge of Kapteyn's Star (KS) - a nearby, low-metallicity M-dwarf, with an eccentric and retrograde Galactic orbit. A brief survey of its spectroscopic properties is provided, together with an analysis of its Gal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d28821ebc7ec8cad57518ea3cf7fd68a
https://doi.org/10.1051/0004-6361:20042287
https://doi.org/10.1051/0004-6361:20042287
Autor:
P. C. Dawson, M. M. De Robertis
Publikováno v:
Publications of the Astronomical Society of the Pacific. 117:1-12
We present 178 radial velocity measurements for 166 late-type stars selected from the Luyten half-second (LHS) proper motion catalog. Space velocities are given for all but two of them. Most of the stars lie within 25 pc of the Sun, but the list incl
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::db67830adb858122a2b530d616a88815
https://doi.org/10.1086/427790
https://doi.org/10.1086/427790
Autor:
P. C. Dawson, M. M. De Robertis
Publikováno v:
The Astronomical Journal. 127:2909-2914
The recently measured angular diameter of Barnard's star, together with its large and precise parallax, and a spectral energy distribution that extends from the near-ultraviolet to almost 12 μm establish some of the star's fundamental properties—w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::81927c550ac744ed1f35f31abcad3a9a
https://doi.org/10.1086/383289
https://doi.org/10.1086/383289
Publikováno v:
The Astronomical Journal. 120:1739-1749
A technique is described that permits the robust decomposition of the bulge and disk components of a sample of Seyfert galaxies, as well as a (control) sample of non-active galaxies matched to the Seyferts in the distributions of redshift, luminosity
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7012737a564ab27f8d7b4f825fe32c11
https://doi.org/10.1086/301586
https://doi.org/10.1086/301586
Autor:
M. M. De Robertis, P. C. Dawson
Publikováno v:
The Astronomical Journal. 120:1532-1540
Spectra of 10 late-type dwarfs are compared with synthetic spectra derived from the NextGen models of Hauschildt, Allard, & Baron. Effective temperatures and metallicities are thereby estimated, generally under the assumption that log g = 5.0. The st
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21c8d67f7f02852b8a2565d54c4525db
https://doi.org/10.1086/301538
https://doi.org/10.1086/301538
Publikováno v:
The Astronomical Journal. 119:1956-1967
Spectral energy distributions from recent model atmospheres covering a broad range of temperature and metallicity are used to synthesize colors for low-mass stars. Color-color diagrams can therefore be prepared in which each point corresponds to a pa
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3b856736ead8c0b68ed5c359fd841087
https://doi.org/10.1086/301292
https://doi.org/10.1086/301292
Autor:
M. M. De Robertis, P. C. Dawson
Publikováno v:
The Astronomical Journal. 116:2565-2568
We report 27 radial velocity measurements for 24 stars, all with annual proper motions larger than 1''. For 17 of these, no velocities have previously been published. We identify a few stars that may be spectroscopic binaries and a sdK star of specta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3f74a2b2373b92131c4465609dc40ea5
https://doi.org/10.1086/300589
https://doi.org/10.1086/300589