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The 3D geometry of reflection nebulae IC 59 and IC 63 with their illuminating star gamma Cas
Lai, Thomas S. -Y.; Witt, Adolf N.; Caputo, Miranda +1 more
The early-type star gamma Cas illuminates the reflection nebulae IC 59 and IC 63, creating two photodissociation regions (PDRs). Uncertainties about the distances to the nebulae and the resulting uncertainty about the density of the radiation fields incident on their surfaces have hampered the study of these PDRs during the past three decades. We …
Stellar halo density with LAMOST K and M giants
Wang, H. -F.; López-Corredoira, M.; Liu, C. +3 more
Aims: We derive the morphology of the stellar component in the outer halo volume, and search for possible overdensities due to substructures therein.
Methods: We made use of some of the data releases of the spectroscopic survey LAMOST DR8-DR9 in tandem with distance determinations for two subsamples, that is, of K-giants and M-giants, re…
Solar Energetic Particle and the Heliospheric Current Sheet
Wu, Chin-Chun; Liou, Kan
The effect of the heliospheric current sheet (HCS) on the propagation of solar energetic particles (SEPs) remains poorly known. In this study we address this question by surveying energetic (∼2.0–9.6 MeV nucleon–1) helium data acquired by the energetic particle acceleration, composition, and transport (EPACT) sensor on board the Wind sp…
X-ray measurement of a high-mass white dwarf and its spin for the intermediate polar IGR J18434-0508
Hare, Jeremy; Mukai, Koji; Tomsick, John A. +8 more
IGR J18434-0508 is a Galactic Intermediate Polar (IP) type Cataclysmic Variable (CV) previously classified through optical spectroscopy. The source is already known to have a hard Chandra spectrum. In this paper, we have used follow-up XMM-Newton and NuSTAR observations to measure the white dwarf (WD) mass and spin period. We measure a spin period…
KAgoshima Galactic Object survey with Nobeyama 45 m telescope by Mapping in Ammonia lines (KAGONMA): Discovery of parsec-scale CO depletion in the Canis Major star-forming region
Shimajiri, Yoshito; Sunada, Kazuyoshi; Omodaka, Toshihiro +6 more
In observational studies of infrared dark clouds, the number of detections of CO freeze-out on to dust grains (CO depletion) at the pc scale is extremely limited, and the conditions for its occurrence are, therefore, still unknown. We report a new object where pc-scale CO depletion is expected. As part of the Kagoshima Galactic Object survey with …
Spectroscopic Observations of the GALEX Nearby Young Star Survey Sample. I. Nearby Moving Group Candidates
Rodriguez, David; Zuckerman, Ben; Vican, Laura +3 more
The GALEX Nearby Young Star Search (GALNYSS) yielded the identification of more than 2000 late-type stars that, based on their ultraviolet and infrared colors and pre-Gaia proper motions, are potentially of age<200 Myr and lie within ~120 pc of Earth. We present the results of a campaign of medium- and high-resolution optical spectroscopy of 47…
Properties of flare events based on light curves from the TESS survey: II. 20-second cadence
Zhang, Liyun; Han, Xianming L.; Misra, Prabhakar +2 more
Aims. Stellar flares are sudden bursts of energy and are the result of magnetic activity. We used light curves from the TESS 20-second cadence survey from 2020 to 2023 to detect flare events and determine their properties. Methods. By means of repeated fitting to distinguish stellar background light curves and flare events, we detected 32 978 flar…
A halo model approach to describe clustering and emission of the two main star-forming galaxy populations for cosmic infrared background studies
Calabrese, E.; Pagano, L.; Negrello, M. +3 more
The cosmic infrared background (CIB), which is traced by the emission from dusty star-forming galaxies, provides a crucial window into the phases of star formation throughout cosmic history. These galaxies, although challenging to detect individually at high redshifts due to their faintness, cumulatively contribute to the CIB, which then becomes a…
A Panchromatic Study of the X-Ray Binary Population in NGC 300 on Subgalactic Scales
Williams, Benjamin F.; Eracleous, Michael; Binder, Breanna A. +3 more
The population-wide properties and demographics of extragalactic X-ray binaries (XRBs) correlate with the star formation rates (SFRs), stellar masses (M ⋆), and environmental factors (such as metallicity, Z) of their host galaxy. Although there is evidence that XRB scaling relations (L X/SFR for high-mass XRBs (HMXBs) and L <…
J-PLUS: The fraction of calcium white dwarfs along the cooling sequence
Hernández-Monteagudo, C.; Hernán-Caballero, A.; Gänsicke, B. T. +24 more
Aims. We used the Javalambre Photometric Local Universe Survey (J-PLUS) second data release (DR2) photometry in 12 optical bands over 2176 deg2 to estimate the fraction of white dwarfs with the presence of Ca II H+K absorption along the cooling sequence. Methods. We compared the J-PLUS photometry against metal-free theoretical models to…