Zobrazeno 1 - 10
of 58
pro vyhledávání: '"DeGennaro, Steven"'
Autor:
Kepler, S. O., Winget, D. E., Vanderbosch, Zachary P., Castanheira, Barbara Garcia, Hermes, J. J., Bell, Keaton J., Mullally, Fergal, Romero, Alejandra D., Montgomery, M. H., DeGennaro, Steven, Winget, Karen I., Chandler, Dean, Jeffery, Elizabeth J., Fritzen, Jamile K., Williams, Kurtis A., Chote, Paul, Zola, Staszek
The pulsating hydrogen atmosphere white dwarf star G 117-B15A has been observed since 1974. Its main pulsation period at 215.19738823(63) s, observed in optical light curves, varies by only (5.12+/-0.82)x10^{-15} s/s and shows no glitches, as pulsars
Externí odkaz:
http://arxiv.org/abs/2010.16062
Autor:
Kilic, Mukremin, Munn, Jeffrey A., Harris, Hugh C., von Hippel, Ted, Liebert, James W., Williams, Kurtis A., Jeffery, Elizabeth, DeGennaro, Steven
We present a detailed analysis of the white dwarf luminosity functions derived from the local 40 pc sample and the deep proper motion catalog of Munn et al (2014, 2017). Many of the previous studies ignored the contribution of thick disk white dwarfs
Externí odkaz:
http://arxiv.org/abs/1702.06984
Autor:
Munn, Jeffrey A., Harris, Hugh C., von Hippel, Ted, Kilic, Mukremin, Liebert, James W., Williams, Kurtis A., DeGennaro, Steven, Jeffery, Elizabeth, Dame, Kyra, Gianninas, A., Brown, Warren R.
A catalog of 8472 white dwarf (WD) candidates is presented, selected using reduced proper motions from the deep proper motion catalog of Munn et al. 2014. Candidates are selected in the magnitude range 16 < r < 21.5 over 980 square degrees, and 16 <
Externí odkaz:
http://arxiv.org/abs/1611.06275
Autor:
von Hippel, Ted, Robinson, Elliot, Jeffery, Elizabeth, Wagner-Kaiser, Rachel, DeGennaro, Steven, Stein, Nathan, Stenning, David, Jefferys, William H., van Dyk, David
BASE-9 is a Bayesian software suite that recovers star cluster and stellar parameters from photometry. BASE-9 is useful for analyzing single-age, single-metallicity star clusters, binaries, or single stars, and for simulating such systems. BASE-9 use
Externí odkaz:
http://arxiv.org/abs/1411.3786
Autor:
Jeffery, Elizabeth J., von Hippel, Ted, DeGennaro, Steven, van Dyk, David, Stein, Nathan, Jefferys, William H.
Publikováno v:
The Astrophysical Journal (2011), 730, 35
We present deep photometric observations of the open cluster NGC 2477 using HST/WFPC2. By identifying seven cluster white dwarf candidates, we present an analysis of the white dwarf age of this cluster, using both the traditional method of fitting is
Externí odkaz:
http://arxiv.org/abs/1102.3459
Autor:
Kilic, Mukremin, Munn, Jeffrey A., Williams, Kurtis A., Kowalski, P. M., von Hippel, Ted, Harris, Hugh C., Jeffery, Elizabeth J., DeGennaro, Steven, Brown, Warren R., McLeod, B.
We report the discovery of three nearby old halo white dwarf candidates in the Sloan Digital Sky Survey (SDSS), including two stars in a common proper motion binary system. These candidates are selected from our 2800 square degree proper motion surve
Externí odkaz:
http://arxiv.org/abs/1004.0958
Publikováno v:
Annals of Applied Statistics 2009, Vol. 3, No. 1, 117-143
Color-Magnitude Diagrams (CMDs) are plots that compare the magnitudes (luminosities) of stars in different wavelengths of light (colors). High nonlinear correlations among the mass, color, and surface temperature of newly formed stars induce a long n
Externí odkaz:
http://arxiv.org/abs/0905.2547
Publikováno v:
Astrophys.J.694:327-331,2009
We present infrared observations in search of a planet around the white dwarf, GD66. Time-series photometry of GD66 shows a variation in the arrival time of stellar pulsations consistent with the presence of a planet with mass > 2.4Mj. Any such plane
Externí odkaz:
http://arxiv.org/abs/0812.2951
Autor:
Montgomery, M. H., Williams, Kurtis A., Winget, D. E., Dufour, Patrick, Degennaro, Steven, Liebert, James
We present the results of a search for pulsations in six of the recently discovered carbon-atmosphere white dwarf ("hot DQ") stars. Based on our theoretical calculations, the star SDSS J142625.71+575218.3 is the only object expected to pulsate. We ob
Externí odkaz:
http://arxiv.org/abs/0803.2646
Autor:
Mullally, F., Winget, D. E., Degennaro, Steven, Jeffery, Elizabeth, Thompson, S. E., Chandler, Dean
We present limits on planetary companions to pulsating white dwarf stars. A subset of these stars exhibit extreme stability in the period and phase of some of their pulsation modes; a planet can be detected around such a star by searching for periodi
Externí odkaz:
http://arxiv.org/abs/0801.3104