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M67 Blue Stragglers with High-resolution Infrared Spectroscopy
K. E. Brady, C. Sneden, C. A. Pilachowski +5
We report on the first detailed infrared chemical analysis of five binary members (S277, S997, S975, S1031, and S1195) in the open cluster M67 (NGC 2682). These stars are located o…
A Gigantic Mid-Infrared Outburst in an Embedded Class-I Young Stellar Object J064722.95+031644.6
Tinggui Wang, Jiaxun Li, Gregory M. Mace +4
We report the serendipitous discovery of a giant mid-infrared (MIR) outburst from a previously unknown source near a star-forming region in the constellation Monoceros. The source…
M giants with IGRINS I. Stellar parameters and -abundance trends of the solar neighborhood population
G. Nandakumar, N. Ryde, L. Casagrande +1
Cool stars, such as M giants, can only be analysed in the near-infrared (NIR) regime due to the ubiquitous TiO features in optical spectra of stars with Teff < 4000 K. In dust obsc…
Effective Temperature Estimations from Line Depth Ratios in the \H\ and \K-band Spectra of IGRINS
Melike Afşar, Zeynep Bozkurt, Gamze Böcek Topcu +5
Determining accurate effective temperatures of stars buried in the dust-obscured Galactic regions is extremely difficult from photometry. Fortunately, high-resolution infrared spec…
The IGRINS YSO Survey III: Stellar parameters of pre-main sequence stars in Ophiuchus and Upper Scorpius
Ricardo López-Valdivia, Gregory N. Mace, Eunkyu Han +9
We used the Immersion GRating Infrared Spectrometer (IGRINS) to determine fundamental parameters for 61 K- and M-type young stellar objects (YSOs) located in the Ophiuchus and Uppe…
Distance and age of the massive stellar cluster Westerlund 1. II. The eclipsing binary W36
Danilo F. Rocha, Leonardo A. Almeida, Augusto Damineli +3
Westerlund 1 (Wd 1) is one of the most relevant star clusters in the Milky Way to study massive star formation, although it is still poorly known. Here, we used photometric and spe…
The Active Chromospheres of Lithium-Rich Red Giant Stars
Christopher Sneden, Melike Afsar, Zeynep Bozkurt +17
We have gathered near-infrared -band high resolution spectra of nearly 300 field red giant stars with known lithium abundances in order to survey their \species{He}{i} 1083…
A 1.46-2.48 m Spectroscopic Atlas of a T6 Dwarf (1060 K) Atmosphere with IGRINS: First Detections of HS and H, and Verification of HO, CH, and NH Line Lists
Megan E. Tannock, Stanimir Metchev, Callie E. Hood +5
We present Gemini South/IGRINS observations of the 1060 K T6 dwarf 2MASS J081730016155158 with unprecedented resolution () and signal-to-noise ratio (SNR >…
V899 Mon: a peculiar eruptive young star close to the end of its outburst
Sunkyung Park, Ágnes Kóspál, Fernando Cruz-Sáenz de Miera +15
V899 Mon is an eruptive young star showing characteristics of both FUors and EXors. It reached a peak brightness in 2010, then briefly faded in 2011, followed by a second outburst.…
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…
An Improved Near-Infrared Spectrum of the Archetype Y Dwarf WISEP J182831.08+265037.8
Michael C. Cushing, Adam C. Schneider, J. Davy Kirkpatrick +8
We present a Hubble Space Telescope/Wide-Field Camera 3 near infrared spectrum of the archetype Y dwarf WISEP 182831.08+265037.8. The spectrum covers the 0.9-1.7 um wavelength rang…
Evidence of Accretion Burst: The Viscously Heated Inner Disk of the Embedded Protostar IRAS 16316-1540
Sung-Yong Yoon, Jeong-Eun Lee, Seokho Lee +5
Outbursts of young stellar objects occur when the mass accretion rate suddenly increases. However, such outbursts are difficult to detect for deeply embedded protostars due to thei…
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…
Chemical Compositions of Red Giant Stars from Habitable Zone Planet Finder Spectroscopy
Christopher Sneden, Melike Afsar, Zeynep Bozkurt +15
We have used the Habitable Zone Planet Finder (HPF) to gather high resolution, high signal-to-noise near-infrared spectra of 13 field red horizontal-branch (RHB) stars, one open-cl…
NLTT5306B: an inflated, weakly irradiated brown dwarf
S. L. Casewell, J. Debes, I. P. Braker +4
We present Spitzer observations at 3.6 and 4.5 microns and a near-infrared IRTF SpeX spectrum of the irradiated brown dwarf NLTT5306B. We determine that the brown dwarf has a spect…
Constraining Nucleosynthesis in Two CEMP Progenitors Using Fluorine
A. Mura-Guzmán, D. Yong, C. Abate +6
We present new fluorine abundance estimations in two carbon enhanced metal-poor (CEMP) stars, HE 1429-0551 and HE 1305+0007. HE 1429-0551 is also enriched in slow neutron-capture p…
High-resolution spectroscopic monitoring observations of FU Orionis-type object, V960 Mon
Sunkyung Park, Jeong-Eun Lee, Tae-Soo Pyo +9
We present the results of high-resolution (R 30,000) optical and near-infrared spectroscopic monitoring observations of a FU Orionis-type object, V960 Mon, which underwent an…
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…
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…
Compact Disks in a High Resolution ALMA Survey of Dust Structures in the Taurus Molecular Cloud
Feng Long, Gregory J. Herczeg, Daniel Harsono +24
We present a high-resolution (, au, mean sensitivity of Jy~beam at 225 GHz) snapshot survey of 32 protoplanetary disks around young stars with spe…
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…