Results 11 to 20 of about 10,044,096 (256)

K-band spectroscopic metallicities and temperatures of M-dwarf stars

EPJ Web of Conferences, 2013
I present the metallicity and effective temperature techniques developed for M dwarf stars by Rojas-Ayala et al. (2010, 2012). These techniques are based on absorption features present in the modest resolution K-band spectra (R∼2700) of M dwarfs and have
Rojas-Ayala Bárbara
doaj   +2 more sources

Forming rocky exoplanets around K-dwarf stars [PDF]

, 2023
How multiple close-in super-Earths form around stars with masses lower than that of the Sun is still an open issue. Several recent modeling studies have focused on planet formation around M-dwarf stars, but so far no studies have focused specifically on ...
P. Hatalova, R. Brasser, E. Mamonova, S. C. Werner, Werner, S. C., Hatalova, P., Mamonova, E., Brasser, R.   +7 more
core   +1 more source

Hot DAVs: a probable new class of pulsating white dwarf stars [PDF]

, 2013
We have discovered a pulsating DA white dwarf at the lower end of the temperature range 45 000–30 000 K where a few helium atmosphere white dwarfs are known. There are now three such pulsators known, suggesting that a new class of theoretically predicted
Gansicke, B. T., Marsh, Tom, Kurtz, D.W., Copperwheat, Chris M., Kurtz, Donald Wayne, Copperwheat, C.M., Copperwheat, C. M., Gaensicke, B. T., Littlefair, Stuart P., Dhillon, V. S., Littlefair, S.P., Parsons, Steven G., Parsons, S. G., Kurtz, D. W., Gänsicke, B.T., Parsons, S.G., Marsh, T.R., Dhillon, Vik S., Dhillon, V.S., Littlefair, S. P., Shibahashi, H., Marsh, T. R.   +21 more
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Atmospheres of brown dwarfs [PDF]

, 2014
ChH highlights financial support of the European Community under the FP7 by an ERC starting grant. SLC acknowledges financial support of University of LeicesterBrown Dwarfs are the coolest class of stellar objects known to date. Our present perception is
Casewell, Sarah, Helling, Christiane
core   +1 more source

Elemental abundances in the Galactic bulge from microlensed dwarf stars [PDF]

, 2010
We present elemental abundances of 13 microlensed dwarf and subgiant stars in the Galactic bulge, which constitute the largest sample to date. We show that these stars span the full range of metallicity from Fe/H= −0.8 to +0.4, and that they follow well ...
Feltzing, S., Adén, Daniel, Johnson, J., Sana, H., Sana, Hugues, Feltzing, Sofia, Johnson, J.A., Melendez, J., Kubas, D., Asplund, M., Bensby, Thomas, Gould, A., Gal-Yam, A., Adén, D., Udalski, A., Lucatello, S., Simmerer, J., Feltzing, Sofia,, Bensby, T., James, G., Simmerer, Jennifer, Bensby, Thomas,   +21 more
core   +1 more source

Long Period Variables in Local Group Dwarf Galaxies [PDF]

, 2006
In this work the results are presented of an extensive search for Long Period Variables stars (LPVs) in a sample of Local Group irregular dwarf galaxies.
Snigula, Jan
core   +1 more source

The Carbon Star DY Persei May Be a Cool R Coronae Borealis Variable

The Astrophysical Journal, 2023
Optical and near-IR photometry suggests that the carbon star DY Persei exhibits fadings similar to those of R Coronae Borealis (RCB) variables. Photometric surveys of the Galaxy and Magellanic Clouds uncovered new DY Per variables with infrared ...
D. A. García-Hernández, N. Kameswara Rao, David L. Lambert, K. Eriksson, A. B. S. Reddy, Thomas Masseron   +5 more
doaj   +1 more source

NGTS-1b: A hot Jupiter transiting an M-dwarf

, 2017
We present the discovery of NGTS-1b, a hot-Jupiter transiting an early M-dwarf host (Teff,∗=3916 +71 −63 K) in a P = 2.647 d orbit discovered as part of the Next Generation Transit Survey (NGTS).
Alexander Chaushev (7751315), Michael R. Goad (7580096), Sarah L. Casewell (7627856), Matthew R. Burleigh (7579703), et al. (281964), Richard D. Alexander (7606943), Andrew Grange (7751321), Liam Raynard (7708694)   +7 more
core   +3 more sources

A new spectroscopic calibration to determine Teff and [Fe/H] of FGK dwarfs and giants

EPJ Web of Conferences, 2017
We present a new spectroscopic calibration for a fast estimate of Teff and [Fe/H] for FGK dwarfs and GK giant stars. We used spectra from a joint sample of 708 stars, composed by 451 FGK dwarfs and 257 GK-giant stars with homogeneously determined ...
Teixeira G. D. C., Sousa S. G., Tsantaki M., Monteiro M. J. P. F. G., Santos N. C., Israelian G.   +5 more
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Mass Production of 2021 KMTNet Microlensing Planets. III. Analysis of Three Giant Planets

The Astronomical Journal, 2022
We present the analysis of three more planets from the KMTNet 2021 microlensing season. KMT-2021-BLG-0119Lb is a ∼6 M _Jup planet orbiting an early M dwarf or a K dwarf, KMT-2021-BLG-0192Lb is a ∼2 M _Nep planet orbiting an M dwarf, and KMT-2021-BLG ...
In-Gu Shin, Jennifer C. Yee, Andrew Gould, Kyu-Ha Hwang, Hongjing Yang, Ian A. Bond, (Leading Authors), Michael D. Albrow, Sun-Ju Chung, Cheongho Han, Youn Kil Jung, Yoon-Hyun Ryu, Yossi Shvartzvald, Weicheng Zang, Sang-Mok Cha, Dong-Jin Kim, Seung-Lee Kim, Chung-Uk Lee, Dong-Joo Lee, Yongseok Lee, Byeong-Gon Park, Richard W. Pogge, (The KMTNet Collaboration), Fumio Abe, Richard Barry, David P. Bennett, Aparna Bhattacharya, Hirosane Fujii, Akihiko Fukui, Yuki Hirao, Stela Ishitani Silva, Yoshitaka Itow, Rintaro Kirikawa, Iona Kondo, Naoki Koshimoto, Yutaka Matsubara, Sho Matsumoto, Shota Miyazaki, Yasushi Muraki, Arisa Okamura, Greg Olmschenk, Clément Ranc, Nicholas J. Rattenbury, Yuki Satoh, Takahiro Sumi, Daisuke Suzuki, Taiga Toda, Paul . J. Tristram, Aikaterini Vandorou, Hibiki Yama, (The MOA Collaboration)   +50 more
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