Zobrazeno 1 - 10
of 302
pro vyhledávání: '"Anthony Twarog"'
Autor:
Sun, Qinghui, Ting, Yuan-Sen, Liu, Fan, Wang, Sharon Xuesong, Anthony-Twarog, Barbara J., Twarog, Bruce A., Yang, Jia-Yi, Chen, Di-Chang, Karakas, Amanda I., Xie, Ji-Wei, Yong, David
Planet engulfment has been identified as one of the mechanisms for enhancing lithium abundance in stars. However, comprehensive investigations into lithium signatures following such events remain limited. Stars born together, sharing a common origin
Externí odkaz:
http://arxiv.org/abs/2410.20632
Autor:
Anthony Twarog
Publikováno v:
Transformative Works and Cultures, Vol 38 (2022)
When a group of fan volunteers created StillFlying.net, a site that hosted Virtual Firefly (VFF), a continuation of the Fox 2002–3 series Firefly, they organized their labor in a way that mirrored actual television production crews, dividing contri
Externí odkaz:
https://doaj.org/article/ce658c91776e4426b33a102263bad8e6
Autor:
Anthony-Twarog, Barbara J., Deliyannis, Constantine P., Steinhauer, Aaron, Sun, Qinghui, Twarog, Bruce A.
We have analyzed high-dispersion spectra in the Li 6708 Angstrom region for 167 stars within the anticenter cluster, NGC 2204. From 105 probable members, abundance analysis of 45 evolved stars produces [Fe/H] = -0.40 +/- 0.12, [Si/Fe] = 0.14 +/- 0.12
Externí odkaz:
http://arxiv.org/abs/2406.18688
Autor:
Sun, Qinghui, Deliyannis, Constantine P., Steinhauer, Aaron, Anthony-Twarog, Barbara J., Twarog, Bruce A.
We consider WIYN/Hydra spectra of 329 photometric candidate members of the 420-Myr-old open cluster M48, and report Lithium detections or upper limits for 234 members and likely members. The 171 single members define a number of notable Li-mass trend
Externí odkaz:
http://arxiv.org/abs/2303.09783
Precision CCD uvbyCaHbeta photometry is presented of the old cluster, M67, covering one square degree with typical internal precision at the 0.005-0.020 mag level to V~17. The photometry is calibrated using standards over a wide range in luminosity a
Externí odkaz:
http://arxiv.org/abs/2301.09538
Autor:
Sun, Qinghui, Deliyannis, Constantine P., Twarog, Bruce A., Anthony-Twarog, Barbara J., Cummings, Jeffrey D., Steinhauer, Aaron
We present WIYN/Hydra spectra of 34 red giant candidate members of NGC 188, which, together with WOCS and Gaia data yield 23 single members, 6 binary members, 4 single nonmembers, and 1 binary nonmember. We report [Fe/H] for 29 members and derive [Fe
Externí odkaz:
http://arxiv.org/abs/2205.00631
High-dispersion spectra in the Li 6708 Angstrom region have been obtained and analyzed in the old, metal-deficient cluster, NGC 2243. From Hydra spectra for 29 astrometric and radial-velocity members, we derive rotational velocities, as well as [Fe/H
Externí odkaz:
http://arxiv.org/abs/2102.05141
Open clusters (OC) of 1-3 Gyr age contain intermediate-to-low-mass stars in evolutionary phases of multiple relevance to understanding Li evolution. Stars leaving the main sequence (MS) from the hot side of the Lithium dip (LD) at a fixed age can inc
Externí odkaz:
http://arxiv.org/abs/2006.11157
High-dispersion spectra for giants through turnoff stars in the Li 6708 Angstrom region have been obtained and analyzed in the old, metal-deficient open cluster, NGC 2243. When combined with high dispersion data from other surveys, the cluster is fou
Externí odkaz:
http://arxiv.org/abs/2006.10862
Autor:
Sun, Qinghui, Deliyannis, Constantine P., Twarog, Bruce A., Anthony-Twarog, Barbara J., Steinhauer, Aaron
Publikováno v:
2020AJ....159..246
We present $UBVRI$ photometry of 8702 stars in a $0.5 ^\circ\times0.5 ^\circ$ field in the direction of NGC 7142, taken with the Half Degree Imager (HDI) at the WIYN 0.9-meter telescope, to improve knowledge of this cluster's basic parameters. Our ph
Externí odkaz:
http://arxiv.org/abs/2004.10902