233 citations · 2.5k across the 60 of their papers we have counts for
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ABYSS. IV. Identifying signatures of stellar youth in APOGEE spectra
Valentina Bonilla Villalobos, Marina Kounkel, Joseph Mullen +9
We develop a convolutional neural network classifier that performs spectroscopic identification of stellar youth (<40 Myr) in APOGEE spectra. This classifier is sensitive to severa…
Atmospheric parameters and chemical abundances of young stars with APOGEE. I. Orion star-forming region
Ricardo López-Valdivia, Lucía Adame, Carlos G. Román-Zúñiga +19
We derive atmospheric parameters and chemical abundances in young G-, K-, and M-type stars (temperatures between 6500 and 3100 K) using infrared APOGEE-2 spectra. Atmospheric param…
ABYSS III: Observing accretion activity in young stars through empirical veiling measurements
Serat Saad, Marina Kounkel, Keivan G. Stassun +5
Stellar accretion plays an important role in the early stages of stellar evolution, particularly in Classical T Tauri Stars (CTTSs). Accretion of a CTTS can be related to different…
The past, present and future of observations of externally irradiated disks
Planet formation environments collaboration, Megan Allen, Rossella Anania +51
Recent years have seen a surge of interest in the community studying the effect of ultraviolet radiation environment, predominantly set by OB stars, on protoplanetary disc evolutio…
ABYSS II: Identification of young stars in optical SDSS spectra and their properties
Serat Saad, Kaitlyn Lane, Marina Kounkel +9
We developed a tool that measures equivalent widths of various lines in low resolution optical spectra, and it was applied to stellar spectra obtained as part of SDSS-V and LAMOST…
Pre-main Sequence Brackett Emitters in the APOGEE DR17 Catalog: Line Strengths and Physical Properties of Accretion Columns
Hunter Campbell, Elliott Khilfeh, Kevin R. Covey +21
Very young (t 10 Myrs) stars possess strong magnetic fields that channel ionized gas from the interiors of their circumstellar discs to the surface of the star. Upon imp…
What's Behind the Elephant's Trunk? Identifying Young Stellar Objects on the Outskirts of IC1396
Steven M. Silverberg, Hans Moritz Guenther, Jinyoung Serena Kim +2
Empirically, the estimated lifetime of a typical protoplanetary disk is Myr. However, the disk lifetimes required to produce a variety of observed exoplanetary systems may…
The Sejong Open Cluster Survey (SOS). VII. A Photometric Study of the Young Open Cluster IC 1590
Seulgi Kim, Beomdu Lim, Michael S. Bessell +2
Young open clusters are ideal laboratories to understand star formation process. We present deep UBV I and Halpha photometry for the young open cluster IC 1590 in the center of the…
Proplyds in the Flame Nebula NGC 2024
Thomas J. Haworth, Jinyoung S. Kim, Andrew J. Winter +5
A recent survey of the inner pc of the NGC 2024 star forming region revealed two distinct millimetre continuum disc populations that appear to be spatially segregat…
An Improved HR Diagram for the Orion Trapezium Cluster
Min Fang, Jinyoung Serena Kim, Ilaria Pascucci +1
In this paper, we present a study of the Trapezium cluster in Orion. We analyze flux-calibrated VLT/MUSE spectra of 361 stars to simultaneously measure the spectral types, reddenin…
The First Extensive Spectroscopic Study of Young Stars in the North America and Pelican Nebulae Region
Min Fang, Lynne A. Hillenbrand, Jinyoung Serena Kim +5
We present a spectroscopic survey of over 3400 potential members in the North America and Pelican nebulae (NAP) using several low-resolution ( 1300-2000) spectrographs: P…
The origin of a distributed stellar population in the star-forming region W4
Beomdu Lim, Jongsuk Hong, Hyeong-Sik Yun +5
Stellar kinematics provides the key to understanding the formation process and dynamical evolution of stellar systems. Here, we present a kinematic study of the massive star-formin…
Spectral classification of B stars: The empirical sequence using SDSS-IV/APOGEE near-IR data
Valeria G. Ramírez-Preciado, Alexandre Román-Lópes, Carlos G. Román-Zuñiga +5
We present a semi-empirical spectral classification scheme for normal B-type stars using near-infrared spectra (1.5-1.7 m) from the SDSS APOGEE2-N DR14 database. The main motiva…
Double-peaked OI profile: a likely signature of the gaseous ring around KH 15D
Min Fang, Ilaria Pascucci, Jinyoung Serena Kim +1
KH 15D is a well-known spectroscopic binary because of its unique and dramatic photometric variability. The variability is explained by a circumbinary dust ring but the ring itself…
Near-Infrared Variability of Low Mass Stars in IC 1396A and TR 37
Huan Y. A. Meng, G. H. Rieke, Jinyoung Serena Kim +5
We have monitored nearly a square degree in IC 1396A/Tr 37 over 21 epochs extending over 2014 - 2016 for sources variable in the JHK bands. In our data, 65 +\- 8 % of previously id…
Close companions around young stars
Marina Kounkel, Kevin Covey, Maxwell Moe +26
Multiplicity is a fundamental property that is set early during stellar lifetimes, and it is a stringent probe of the physics of star formation. The distribution of close companion…
The Intricate Structure of HH 508, the Brightest Microjet in the Orion Nebula
Ya-Lin Wu, Laird M. Close, Jinyoung Serena Kim +2
We present Magellan adaptive optics H imaging of HH 508, which has the highest surface brightness among protostellar jets in the Orion Nebula. We find that HH 508 actually has a…
NGC 1980 is not a foreground population of Orion: Spectroscopic survey of young stars with low extinction in Orion A
Min Fang, Jinyoung Serena Kim, Ilaria Pascucci +6
We perform a spectroscopic survey of the foreground population in Orion A with MMT/Hectospec. We use these data, along with archival spectroscopic data and photometric data, to der…
A Spitzer Space Telescope Survey for Dusty Debris Disks in the Nearby 32 Orionis Group
Alexander J. Shvonski, Eric E. Mamajek, Jinyoung Serena Kim +2
We report Spitzer Space Telescope IRAC 3.6, 4.5, 5.8 and 8 um and MIPS 24 and 70 um observations of the 32 Ori Group, a recently discovered nearby stellar association situated towa…
A candidate planetary-mass object with a photoevaporating disk in Orion
Min Fang, Jinyoung Serena Kim, Ilaria Pascucci +2
In this work, we report the discovery of a candidate planetary-mass object with a photoevaporating protoplanetary disk, Proplyd 133-353, which is near the massive star Ori…
A constraint on the formation timescale of the young open cluster NGC 2264: Lithium abundance of pre-main sequence stars
Beomdu Lim, Hwankyung Sung, Jinyoung S. Kim +3
The timescale of cluster formation is an essential parameter in order to understand the formation process of star clusters. Pre-main sequence (PMS) stars in nearby young open clust…
Proplyds around a B1 star - 42 Orionis in NGC 1977
Jinyoung Serena Kim, Cathie J. Clarke, Min Fang +1
We present the discovery of seven new proplyds (i.e. sources surrounded by cometary Halpha emission characteristic of offset ionization fronts) in NGC 1977, located about 30' north…
Sejong open cluster survey (SOS) - V. The active star forming region Sh 2-255 -- 257
Beomdu Lim, Hwankyung Sung, Hyeonoh Hur +6
There is much observational evidence that active star formation is taking place in the HII regions Sh 2-255 -- 257. We present a photometric study of this star forming region (SFR)…
The O- and B-Type Stellar Population in W3: Beyond the High-Density Layer
Megan M. Kiminki, Jinyoung Serena Kim, Micaela B. Bagley +2
We present the first results from our survey of the star-forming complex W3, combining VRI photometry with multiobject spectroscopy to identify and characterize the high-mass stell…