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pro vyhledávání: '"Lai, David K"'
Autor:
Lai, David K.
Publikováno v:
Digital Dissertations Database. Restricted to UC campuses..
Thesis (Ph.D.)-University of California, Santa Cruz, 2008.
Typescript. Includes bibliographical references (leaves 184-198) Also available online. Restricted to UC campuses.
Typescript. Includes bibliographical references (leaves 184-198) Also available online. Restricted to UC campuses.
Externí odkaz:
http://uclibs.org/PID/11984
Autor:
Lai, David K., Lee, Young Sun, Bolte, Michael, Lucatello, Sara, Beers, Timothy C., Johnson, Jennifer A., Sivarani, Thirupathi, Rockosi, Constance M.
We present the results of a low-resolution spectral abundance study of 25 stars in the Bootes I dwarf spheroidal (dSph) galaxy. The data were obtained with the LRIS instrument at Keck Observatory, and allow us to measure [Fe/H], [C/Fe], and [alpha/Fe
Externí odkaz:
http://arxiv.org/abs/1106.2168
Autor:
Lai, David K., Smith, Graeme H., Bolte, Michael, Johnson, Jennifer A., Lucatello, Sara, Kraft, Robert P., Sneden, Christopher
We present analysis of high-resolution spectra of a sample of stars in the globular cluster M5 (NGC 5904). The sample includes stars from the red giant branch (seven stars), the red horizontal branch (two stars), and the asymptotic giant branch (eigh
Externí odkaz:
http://arxiv.org/abs/1101.0832
We describe a three hour inquiry activity involving converging lenses and telescopes as part of a semester-long astronomy lab course for non-science majors at Hartnell Community College in Salinas, CA. Students were shown several short demonstrations
Externí odkaz:
http://arxiv.org/abs/1010.3266
Autor:
Lee, Young Sun, Beers, Timothy C., Prieto, Carlos Allende, Lai, David K., Rockosi, Constance M., Morrison, Heather L., Johnson, Jennifer A., An, Deokkeun, Sivarani, Thirupathi, Yanny, Brian
We present a method for the determination of [alpha/Fe] ratios from low-resolution (R = 2000) SDSS/SEGUE stellar spectra. By means of a star-by-star comparison with degraded spectra from the ELODIE spectral library and with a set of moderately high-r
Externí odkaz:
http://arxiv.org/abs/1010.2934
Autor:
Lai, David K., Rockosi, Constance M., Bolte, Michael, Johnson, Jennifer A., Beers, Timothy C., Lee, Young Sun, Prieto, Carlos Allende, Yanny, Brian
Publikováno v:
Astrophys.J.697:L63-L67,2009
As part of a program to measure abundance ratios in stars beyond 15 kpc from the Galactic center, we have discovered a metal-poor star in the outer halo with a unique chemical signature. We originally identified it in the Sloan Extension for Galactic
Externí odkaz:
http://arxiv.org/abs/0904.4693
Autor:
Lai, David K., Bolte, Michael, Johnson, Jennifer A., Lucatello, Sara, Heger, Alexander, Woosley, S. E.
Publikováno v:
Astrophys.J.681:1524-1556,2008; Erratum-ibid.722:1984,2010
We present the results of an abundance analysis for a sample of stars with $-4<$[Fe/H]$<-2$. The data were obtained with the HIRES spectrograph at Keck Observatory. The set includes 28 stars, with effective temperature ranging from 4800 to 6600 K. Fo
Externí odkaz:
http://arxiv.org/abs/0804.1370
Publikováno v:
AIP Conf.Proc.990:145-147,2008
We present initial results measuring the companion fraction of metal-poor stars ([Fe/H]$<-$2.0). We are employing the Lick Observatory planet-finding system to make high-precision Doppler observations of these objects. The binary fraction of metal-po
Externí odkaz:
http://arxiv.org/abs/0708.4204
We present carbon and strontium abundances for 100 metal-poor stars measured from R$\sim $7000 spectra obtained with the Echellette Spectrograph and Imager at the Keck Observatory. Using spectral synthesis of the G-band region, we have derived carbon
Externí odkaz:
http://arxiv.org/abs/0706.3043
Autor:
Lai, David K, Lee, Young Sun, Bolte, Michael, Lucatello, Sara, Beers, Timothy C, Johnson, Jennifer A, Sivarani, Thirupathi, Rockosi, Constance M
Publikováno v:
Lai, David K; Lee, Young Sun; Bolte, Michael; Lucatello, Sara; Beers, Timothy C; Johnson, Jennifer A; et al.(2011). THE [Fe/H], [C/Fe], AND [α/Fe] DISTRIBUTIONS OF THE BOÃTES I DWARF SPHEROIDAL GALAXY. The Astrophysical Journal, 738(1), 51. doi: 10.1088/0004-637X/738/1/51. UC Santa Cruz: Retrieved from: http://www.escholarship.org/uc/item/7fw5p25n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______325::a887568c139972f30cc6f1649a11e145
http://www.escholarship.org/uc/item/7fw5p25n
http://www.escholarship.org/uc/item/7fw5p25n