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New insights into the use of Ultra Long Period Cepheids as cosmological standard candles
Marconi, Marcella; Molinaro, Roberto; Ripepi, Vincenzo +4 more
Ultra Long Period Cepheids (ULPs) are pulsating variable stars with a period longer than 80 d and have been hypothesized to be the extension of the Classical Cepheids (CCs) at higher masses and luminosities. If confirmed as standard candles, their intrinsic luminosities, ∼1 to ∼3 mag brighter than typical CCs, would allow to reach the Hubble flow …
Radial Segregation between Red Giant Populations in the Globular Cluster NGC 3201: Tentative Role of Varying Mass among the Progenitors
Kravtsov, Valery; Calderón, Francisco A.
In the globular cluster NGC 3201, we study subpopulations (SPs) of red giants (RGs) distinguished by their characteristics. In its central part, we make use of multicolor Hubble Space Telescope (HST) photometry coupled with spectroscopy of RGs spread out over a larger cluster face. In the color index CI $=\,({m}_{{\rm{F}}275{\rm{W}}}-{m}_{{\rm{F}}…
The X-rays wind connection in PG 2112+059
Bauer, F. E.; Brandt, W. N.; Chartas, G. +4 more
We study the connection between the X-ray and ultraviolet (UV) properties of the broad absorption line (BAL) wind in the highly X-ray variable quasar PG 2112+059 by comparing Chandra-ACIS data with contemporaneous UV HST/STIS spectra in three different epochs. We observe a correlation whereby an increase in the equivalent widths (EWs) of the BALs …
SEDBYS: A python-based SED Builder for Young Stars
Davies, Claire L.
Spectral energy distributions (SEDs) are useful primary and complementary tools in the analysis of observations of young stars. However, the process of collating, inspecting, and flux-converting archival photometry and spectroscopy to build spectral energy distributions for young stars is time-consuming. Here, I present SEDBYS (Spectral Energy Dis…
A Multiwavelength Dynamical State Analysis of ACT-CL J0019.6+0336
Hilton, Matt; Moodley, Kavilan; Wollack, Edward J. +8 more
In our study, we show a multiwavelength view of ACT-CL J0019.6+0336 (which hosts a radio halo), to investigate the cluster dynamics, morphology, and ICM. We use a combination of XMM-Newton images, Dark Energy Survey (DES) imaging and photometry, SDSS spectroscopic information, and 1.16 GHz MeerKAT data to study the cluster properties. Various X-ra…
In Situ Observations of the Ion Diffusion Region in the Venusian Magnetotail
Barabash, S.; Futaana, Y.; Wei, Y. +8 more
Utilizing the in situ observations of the Analyzer of Space Plasmas and Energetic Atoms (ASPERA 4) and the magnetometer (MAG) onboard Venus Express, we report evidence of crossing the ion diffusion region of magnetic reconnection. Evidence of magnetic reconnection is based on two cases recorded by Venus Express in the Venusian magnetotail. In both…
Asteroseismology of the heartbeat star KIC 5006817
Merc, J.; Sánchez Arias, J. P.; Beck, P. G. +2 more
This paper summarizes the project work on asteroseismology at the ERASMUS+ GATE 2020 Summer school on space satellite data. The aim was to do a global asteroseismic analysis of KIC 5006817, and quantify its stellar properties using the high-quality, state of the art space missions data. We employed the aperture photometry to analyze the data from …
Ultraluminous X-ray sources in seven edge-on spiral galaxies
Kundu, Arunav; Strader, Jay; Dage, Kristen C. +8 more
We investigate a sample of seven edge-on spiral galaxies using Chandra observations. Edge-on spiral galaxies allow us to clearly separate source associated with their star-forming regions versus the outer edges of the system, offering a clear advantage over other systems. We uncover a number of X-ray point sources across these galaxies, and after …
Jupiter's X-ray aurora during UV dawn storms and injections as observed by XMM-Newton, Hubble, and Hisaki
Coates, A. J.; Branduardi-Raymont, G.; Bonfond, B. +9 more
We present results from a multiwavelength observation of Jupiter's northern aurorae, carried out simultaneously by XMM-Newton, the Hubble Space Telescope (HST), and the Hisaki satellite in 2019 September. HST images captured dawn storms and injection events in the far-ultraviolet aurora several times during the observation period. Magnetic reconne…
UVIT study of UV bright stars in the globular cluster NGC 4147
Pradhan, Ananta C.; Mohapatra, Abhisek; Kumar, Ranjan +4 more
We present far ultraviolet (FUV) observations of globular cluster NGC 4147 using three FUV filters, BaF