Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Gregory Herczeg"'
Autor:
Venu M. Kalari, Ricardo Salinas, Hans Zinnecker, Monica Rubio, Gregory Herczeg, Morten Andersen
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 3 (2024)
Constraints on the binary fraction of massive young stellar objects (mYSOs) are important for binary and massive star formation theory. Here, we present speckle imaging of 34 mYSOs located in the Large Magellanic Cloud (1/2 Z _⊙ ) and Small Magella
Externí odkaz:
https://doaj.org/article/b502a2983e5149c9a6a21de2a49f27e5
Autor:
Geumsook Park, Doug Johnstone, Carlos Contreras Peña, Jeong-Eun Lee, Sheng-Yuan Liu, Gregory Herczeg, Steve Mairs, Zhiwei Chen, Jennifer Hatchell, Kee-Tae Kim, Mi-Ryang Kim, Keping Qiu, Yao-Te Wang, Xu Zhang, The JCMT Transient Team
Publikováno v:
The Astronomical Journal, Vol 168, Iss 3, p 122 (2024)
We present a comprehensive analysis of young stellar object (YSO) variability within the M17 Southwest Extension (M17 SWex), using 3.5 yr of monitoring data from the James Clerk Maxwell Telescope (JCMT) Transient Survey at submillimeter and 9 yr from
Externí odkaz:
https://doaj.org/article/ed04094cc26b432bb716c9e16b0f4ecc
Autor:
Klaus M. Pontoppidan, Colette Salyk, Andrea Banzatti, Ke Zhang, Ilaria Pascucci, Karin I. Öberg, Feng Long, Carlos Muñoz-Romero, John Carr, Joan Najita, Geoffrey A. Blake, Nicole Arulanantham, Sean Andrews, Nicholas P. Ballering, Edwin Bergin, Jenny Calahan, Douglas Cobb, Maria Jose Colmenares, Annie Dickson-Vandervelde, Anna Dignan, Joel Green, Phoebe Heretz, Gregory Herczeg, Anusha Kalyaan, Sebastiaan Krijt, Tyler Pauly, Paola Pinilla, Leon Trapman, Chengyan Xie
Publikováno v:
The Astrophysical Journal, Vol 963, Iss 2, p 158 (2024)
The JWST Disk Infrared Spectral Chemistry Survey (JDISCS) aims to understand the evolution of the chemistry of inner protoplanetary disks using the Mid-InfraRed Instrument (MIRI) on the James Webb Space Telescope (JWST). With a growing sample of >30
Externí odkaz:
https://doaj.org/article/9fce91bfb7f74aada1b295364f3e3013
Autor:
Sieun Lee, Jeong-Eun Lee, Carlos Contreras Peña, Doug Johnstone, Gregory Herczeg, Seonjae Lee
Publikováno v:
The Astrophysical Journal, Vol 962, Iss 1, p 38 (2024)
Variability in the brightness of young stellar objects (YSOs) is a common phenomenon that can be caused by changes in various factors, including accretion, extinction, disk morphology, interactions between the disk and the stellar photosphere, and th
Externí odkaz:
https://doaj.org/article/7c10ed44990f49c592d51c115eea3f52
Autor:
Laura Flagg, Christopher M. Johns-Krull, Kevin France, Gregory Herczeg, Joan Najita, Allison Youngblood, Adolfo Carvalho, John Carptenter, Scott J. Kenyon, Elisabeth Newton, Keighley Rockcliffe
Molecular hydrogen is the most abundant molecule in the Galaxy and plays important roles for planets, their circumstellar environments, and many of their host stars. We have confirmed the presence of molecular hydrogen in the AU Mic system using high
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c2d1f0b7d2ae46fb080acf029c480264
http://arxiv.org/abs/2206.02636
http://arxiv.org/abs/2206.02636
Autor:
Laura Flagg, Christopher M. Johns-Krull, Kevin France, Gregory Herczeg, Joan Najita, John M. Carpenter, Scott J. Kenyon
Using HST-COS FUV spectra, we have discovered warm molecular hydrogen in the TWA 7 system. TWA 7, a $\sim$9 Myr old M2.5 star, has a cold debris disk and has previously shown no signs of accretion. Molecular hydrogen is expected to be extremely rare
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ffeb6389abbbe2746a4d1c291a7ed310
http://arxiv.org/abs/2108.08327
http://arxiv.org/abs/2108.08327
Publikováno v:
The Astronomical Journal. 161:217
Measurements of gas mass in protoplanetary gas disks form the basis for estimating the conditions of planet formation. Among the most important constraints derived from disk diagnostics are the abundances of gas-phase species critical for understandi
Autor:
Matthew McJunkin, Kevin France, Rebecca N. Schindhelm, Gregory Herczeg, P. Christian Schneider, Alex Brown
Publikováno v:
The Astrophysical Journal. 828:69
Measurements of extinction curves toward young stars are essential for calculating the intrinsic stellar spectrophotometric radiation. This flux determines the chemical properties and evolution of the circumstellar region, including the environment i
Autor:
Laura Ingleby, Nuria Calvet, Edwin Bergin, Gregory Herczeg, Alexander Brown, Richard Alexander, Suzan Edwards, Catherine Espaillat, Kevin France, Scott G. Gregory, Lynne Hillenbrand, Evelyne Roueff, Jeff Valenti, Frederick Walter, Christopher Johns-Krull, Joanna Brown, Jeffrey Linsky, Melissa McClure, David Ardila, Hervé Abgrall, Thomas Bethell, Gaitee Hussain, Hao Yang
Publikováno v:
The Astrophysical Journal. 743:105
Young stars surrounded by disks with very low mass accretion rates are likely in the final stages of inner disk evolution and therefore particularly interesting to study. We present ultraviolet (UV) observations of the ~5-9 Myr old stars RECX-1 and R
Autor:
INGLEBY, LAURA, CALVET, NURIA, GREGORY HERCZEG, BLATY, ALEX, WALTER, FREDERICK, ARDILA, DAVID, ALEXANDER, RICHARD, EDWARDS, SUZAN, ESPAILLAT, CATHERINE, GREGORY, SCOTT G., HILLENBRAND, LYNNE, BROWN, ALEXANDER
Publikováno v:
Astrophysical Journal; 4/20/2013, Vol. 767 Issue 2, p1-20, 20p