150 citations · 843 across the 28 of their papers we have counts for
28 papers
High-Resolution Infrared Spectroscopy of the Dust-Obscured Metal-Poor Open Cluster Trumpler 5
S. Özdemir, M. Afşar, C. Sneden +8
Trumpler 5 is a moderately old, dust-obscured metal-poor open cluster. In this study, high-resolution near-infrared spectroscopic data of seven giant stars from the Trumpler 5 clus…
The IGRINS YSO Survey I. Stellar parameters of pre-main sequence stars in Taurus-Auriga
Ricardo López-Valdivia, Kimberly R. Sokal, Gregory N. Mace +19
We present fundamental parameters for 110 canonical K- & M-type (1.30.13) Taurus-Auriga young stellar objects (YSOs). The analysis produces a simultaneous determination…
Projected Rotational Velocities and Fundamental Properties of Low-Mass Pre-Main Sequence Stars in the Taurus-Auriga Star Forming Region
Larissa A. Nofi, Christopher M. Johns-Krull, Ricardo López-Valdivia +11
The projected stellar rotational velocity () is critical for our understanding of processes related to the evolution of angular momentum in pre-main sequence stars. We pr…
2MASS J04435686+3723033 B: A Young Companion at the Substellar Boundary with Potential Membership in the Pictoris Moving Group
Caprice Phillips, Brendan Bowler, Gregory Mace +2
We present a detailed characterization of 2MASS J04435750+3723031, a low-mass companion orbiting the young M2 star, 2MASS J04435686+3723033, at 7.6 arcseconds (550 AU) with potenti…
Fluorine in the solar neighbourhood: the need for several cosmic sources
Nils Ryde, Henrik Jönsson, Gregory Mace +14
The cosmic origin of fluorine is still not well constrained. Several nucleosynthetic channels at different phases of stellar evolution have been suggested, but these must be constr…
The Mean Magnetic Field Strength of CI Tau
Kimberly R. Sokal, Christopher M. Johns-Krull, Gregory N. Mace +4
We present a blind comparison of two methods to measure the mean surface magnetic field strength of the classical T Tauri star CI Tau based on Zeeman broadening of sensitive spectr…
Chemical Abundances Of Open Clusters From High-Resolution Infrared Spectra. II. NGC 752
G. Böcek Topcu, M. Afsar, C. Sneden +9
We present a detailed near-infrared chemical abundance analysis of 10 red giant members of the Galactic open cluster NGC 752. High-resolution (R45000) near-infrared spectra…
Radial Velocities of Low-mass Candidate TWA Members
Benjamin Kidder, Gregory Mace, Kimberly Sokal +2
Nearby young moving groups provide unique samples of similar age stars for testing the evolution of physical properties. Incomplete and/or incorrect group membership classification…
Effective Temperatures of Low-Mass Stars from High-Resolution H-band Spectroscopy
Ricardo López-Valdivia, Gregory N. Mace, Kimberly R. Sokal +9
High-resolution, near-infrared spectra will be the primary tool for finding and characterizing Earth-like planets around low-mass stars. Yet, the properties of exoplanets can not b…
Chemical Abundances Of Open Clusters From High-Resolution Infrared Spectra. I. NGC 6940
G. Böcek Topcu, M. Afsar, C. Sneden +8
We present near-infrared spectroscopic analysis of 12 red giant members of the Galactic open cluster NGC 6940. High-resolution (R45000) and high signal-to-noise ratio (S/N…
Chandra Observations of the Massive Star-Forming Region Onsala 2
Stephen L. Skinner, Kimberly R. Sokal, Manuel Guedel
Previous radio and infrared observations have revealed an obscured region of high-mass star formation in Cygnus known as Onsala 2 (ON 2). Within this region lies the optically-reve…
Multi-band high resolution spectroscopy rules out the hot Jupiter BD+20 1790b - First data from the GIARPS Commissioning
I. Carleo, S. Benatti, A. F. Lanza +51
Context. Stellar activity is currently challenging the detection of young planets via the radial velocity (RV) technique. Aims. We attempt to definitively discriminate the nature o…
High-resolution near-IR Spectral mapping with H and [Fe II] lines of Multiple Outflows around LkH 234
Heeyoung Oh, Tae-Soo Pyo, Bon-Chul Koo +11
We present a high-resolution, near-IR spectroscopic study of multiple outflows in the LkH 234 star formation region using the Immersion GRating INfrared Spectrometer (IGRINS). S…
Characterizing TW Hydra
Kimberly R. Sokal, Casey P. Deen, Gregory N. Mace +5
At 60 pc, TW Hydra (TW Hya) is the closest example of a star with a gas-rich protoplanetary disk, though TW Hya may be relatively old (3-15 Myr). As such, TW Hya is especially appe…
Zodiacal Exoplanets in Time (ZEIT) VI: a three-planet system in the Hyades cluster including an Earth-sized planet
Andrew W. Mann, Andrew Vanderburg, Aaron C. Rizzuto +11
Planets in young clusters are powerful probes of the evolution of planetary systems. Here we report the discovery of three planets transiting K2-136 (EPIC 247589423), a late K dwar…
Inner warm disk of ESO H 279A revealed by NA I and CO overtone emission lines
A-Ran Lyo, Jongsoo Kim, Jae-Joon Lee +20
We present analysis of near-infrared, high-resolution spectroscopy towards the Flat-spectrum YSO (Young Stellar Object) ESO H 279a (1.5 solar mass) in the Serpens star forming r…
The Spectrum of SS 433 in the H and K Bands
E. L. Robinson, C. S. Froning, D. T. Jaffe +5
SS~433 is an X-ray binary and the source of sub-relativistic, precessing, baryonic jets. We present high-resolution spectrograms of SS 433 in the infrared H and K bands. The spectr…
Excitation of Molecular Hydrogen in the Orion Bar Photodissociation Region From a Deep Near-Infrared IGRINS Spectrum
Kyle F. Kaplan, Harriet L. Dinerstein, Heeyoung Oh +9
We present a deep near-infrared spectrum of the Orion Bar Photodissociation Region (PDR) taken with the Immersion Grating INfrared Spectrometer (IGRINS) on the 2.7 m telescope at t…
Zodiacal Exoplanets in Time (ZEIT) IV: seven transiting planets in the Praesepe cluster
Andrew W. Mann, Eric Gaidos, Andrew Vanderburg +6
Open clusters and young stellar associations are attractive sites to search for planets and to test theories of planet formation, migration, and evolution. We present our search fo…
The Prevalence and Impact of Wolf-Rayet Stars in Emerging Massive Star Clusters
Kimberly R. Sokal, Kelsey E. Johnson, Remy Indebetouw +1
We investigate Wolf-Rayet (WR) stars as a source of feedback contributing to the removal of natal material in the early evolution of massive star clusters. Despite previous work su…
The importance of Wolf-Rayet ionization and feedback on super star cluster evolution
Kimberly R. Sokal, Kelsey E. Johnson, Philip Massey +1
The feedback from massive stars is important to super star cluster (SSC) evolution and the timescales on which it occurs. SSCs form embedded in thick material, and eventually, the…
An Emerging Wolf-Rayet Massive Star Cluster in NGC 4449
Kimberly R. Sokal, Kelsey E. Johnson, Rémy Indebetouw +1
We present a panchromatic investigation of the partially-embedded, emerging massive cluster Source 26 (= S26) in NGC 4449 with optical spectra obtained at Apache Point Observatory…
New X-ray Detections of WNL Stars
Stephen L. Skinner, Svetozar A. Zhekov, Manuel Guedel +2
Previous studies have demonstrated that putatively single nitrogen-type Wolf-Rayet stars (WN stars) without known companions are X-ray sources. However, almost all WN star X-ray de…
Chandra Detects the Rare Oxygen-type Wolf-Rayet Star WR 142 and OB Stars in Berkeley 87
Kimberly R. Sokal, Stephen L. Skinner, Svetozar A. Zhekov +2
We present first results of a Chandra X-ray observation of the rare oxygen-type Wolf-Rayet star WR 142 (= Sand 5 = St 3) harbored in the young, heavily-obscured cluster Berkeley 87…