Zobrazeno 1 - 10
of 162
pro vyhledávání: '"Worthey, Guy"'
Autor:
Chriss, Abigail R., Worthey, Guy
In this study, we extend the dust-independent Hatzidimitriou (1991) relation between cluster age and $d_{B-R}$ color difference between red giant branch (RGB) and red clump (RC) to younger cluster ages. We perform membership analysis on twenty-two op
Externí odkaz:
http://arxiv.org/abs/2402.18538
Hubble Space Telescope's (HST) Space Telescope Imaging Spectrograph (STIS) targeted 556 stars in a long-running program called Next Generation Spectral Library (NGSL) via proposals GO9088, GO9786, GO10222, and GO13776. Exposures through three low res
Externí odkaz:
http://arxiv.org/abs/2301.05335
Autor:
Worthey, Guy, Shi, Xiang
Integrated-light models that incorporate common types of chemically peculiar (CP) stars are assembled using synthetic spectra. Selected spectral features encode significant age information for populations with ages $\sim$50 Myr $<$ age $< \sim$2 Gyr.
Externí odkaz:
http://arxiv.org/abs/2211.05083
The G230LB grating used with STIS's CCD detector scatters red light. In red objects, the scattered light mingles with the ultraviolet signal, causing spurious short-wavelength flux and weakening absorption features. Recent calibration observations ch
Externí odkaz:
http://arxiv.org/abs/2211.05043
Stellar evolution calculations with variable abundance ratios were used to gauge the effects on temperatures, luminosities, and lifetimes in various phases. Individual elements C, N, O, Mg, Si, and Fe were included. Most of the effect relevant to int
Externí odkaz:
http://arxiv.org/abs/2201.11217
Publikováno v:
Phys. Rev. D 108, 103546 (2023)
We investigate reheating in the string-theory-motivated K\"ahler Moduli Inflation I (KMII) potential, coupled to a light scalar field $\chi$ and produce constraints and forecasts based on Cosmic Microwave Background (CMB) and gravitational wave obser
Externí odkaz:
http://arxiv.org/abs/2111.11050
In this talk, I discuss the effects, viability, and predictions of the string-theory-motivated K\"ahler Moduli Inflation I (KMII) potential, coupled to a light scalar field $\chi$, which can provide a possible source for today's dark energy density d
Externí odkaz:
http://arxiv.org/abs/2107.09580
Autor:
Pal, Tathagata, Worthey, Guy
Publikováno v:
Monthly Notices of the Royal Astronomical Society, Volume 506, Issue 3, September 2021, Pages 3669-3677
We investigate the frequency of occurrence of Galactic carbon stars as a function of progenitor mass using Gaia data. Small number statistics limit fidelity, but C star frequency agrees with that observed in the Magellanic Clouds (MCs) down to $m \ap
Externí odkaz:
http://arxiv.org/abs/2105.09366
Autor:
Tang, Baitian, Liu, Chao, Fernandez-Trincado, J. G., Geisler, Doug, Shi, Jianrong, Zamora, Olga, Worthey, Guy, Moreno, Edmundo
The large amount of chemical and kinematic information available in large spectroscopic surveys have inspired the search for chemically peculiar stars in the field. Though these metal-poor field stars ([Fe/H$]<-1$) are commonly enriched in nitrogen,
Externí odkaz:
http://arxiv.org/abs/1812.01656
Autor:
Khan, Islam, Worthey, Guy
Publikováno v:
A&A 615, A115 (2018)
Libraries of stellar spectra find many uses in astrophysics, from photometric calibration to stellar population synthesis. We present low resolution spectra of 40 stars from 0.2 micrometers (ultraviolet) to 1.0 micrometers (near infrared) with excell
Externí odkaz:
http://arxiv.org/abs/1804.00029