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Measurement of interstellar extinction for classical T Tauri stars using far-UV H2 line fluxes
France, K.; Eislöffel, J.; Schneider, P. C. +3 more
Understanding the interstellar and potentially circumstellar extinction in the sight lines of classical T Tauri stars is an important ingredient for constructing reliable spectral energy distributions, which catalyze protoplanetary disk chemistry, for example. Therefore, some attempts of measuring AV toward individual stars have been ma…
In pursuit of precise Ca II H&K chromospheric surface fluxes: A gravity and temperature dependence
Schröder, K. -P.; Jack, D.; Rosas-Portilla, F.
The emission lines of the Ca II H&K doublet present one of the most important channels of radiative cooling for the chromospheres of cool stars. Although most other line emissions (Mg II h&k and numerous iron lines) populate the far-UV and require a very competitive space-born observing time, the Ca II H&K lines in the optical UV are easily access…
Verification of Hypervelocity Bulge Red Clump Stars
Poleski, Radosław; Wojtkowska, Gabriela
We verify candidate hypervelocity red clump stars located in the Galactic bulge that were selected based on the VVV and the Gaia DR2 data by Luna et al. To do so, we analyze data from the OGLE-IV survey: difference images and astrometric time series. We have data for 30 stars out of 34 hypervelocity candidates. We confirmed the high proper motion …
Spatio-spectral-temporal modelling of two young pulsar wind nebulae
Venter, C.; Torres, Diego F.; Sushch, I. +5 more
Recent observations of a few young pulsar wind nebulae (PWNe) have revealed their morphologies in some detail. Given the availability of spatio-spectral-temporal data, we use our multi-zone (1D) leptonic emission code to model the PWNe associated with G29.7
A detailed chemical study of the extreme velocity stars in the galaxy
Wyse, Rosemary F. G.; Hawkins, Keith; Reggiani, Henrique +3 more
Two decades on, the study of hypervelocity stars is still in its infancy. These stars can provide novel constraints on the total mass of the Galaxy and its dark matter distribution. However how these stars are accelerated to such high velocities is unclear. Various proposed production mechanisms for these stars can be distinguished using chemo-dyn…
A study of chemical abundances, rotational velocities, and orbital elements in single-lined spectroscopic binary stars in open clusters
Pereira, C. B.; Holanda, N.; Drake, N. A. +4 more
Binary interactions play a significant role in stellar evolution. In this study, we present a comprehensive analysis of 17 single-lined spectroscopic binary stars and identify two more as 'yellow stragglers', in the context of 15 young open clusters with ages younger than 1.0 Gyr. High-resolution spectroscopy ($R\, \approx \, 48000$) was employed …
Dust and Cold Gas Properties of Starburst HyLIRG Quasars at z ∼ 2.5
Neri, Roberto; Liu, Daizhong; Huang, Jia-Sheng +7 more
Some high-z active galactic nuclei (AGNs) are found to reside in extreme star-forming galaxies, such as hyperluminous infrared galaxies (HyLIRGs), with AGN-removed L IR of >1013 L ⊙. In this paper, we report NOEMA observations of six apparent starburst HyLIRGs associated with optical quasars at z ∼ 2–3 in the St…
The Discovery and Follow-up of Four Transiting Short-period Sub-Neptunes Orbiting M Dwarfs
Lester, Kathryn V.; Ikuta, Kai; Tamura, Motohide +100 more
Sub-Neptunes with radii of 2–3 R ⊕ are intermediate in size between rocky planets and Neptune-sized planets. The orbital properties and bulk compositions of transiting sub-Neptunes provide clues to the formation and evolution of close-in small planets. In this paper, we present the discovery and follow-up of four sub-Neptunes orbiting M…
Predicting Arrival Times of the CCMC CME/Shock Events Based on the SPM3 Model
Feng, Shiwei; Li, Ran; Zhao, Xinhua +5 more
Coronal mass ejection (CME) is a powerful solar phenomenon that can lead to severe space weather events. Forecasting whether and when the corresponding interplanetary coronal mass ejection (ICME) will reach the Earth is very important in space weather study and forecast. At present, many different kinds of models use the near-Sun CME observations …
Early Growth of the Star Formation Rate Function in the Epoch of Reionization: An Approach with Rest-frame Optical Emissions
Asada, Yoshihisa; Ohta, Kouji
We present a star formation rate function (SFRF) at z ~ 6 based on star formation rates (SFRs) derived by spectral energy distribution fitting on data from rest-frame UV to optical wavelengths of galaxies in the CANDELS GOODS-South and North fields. The resulting SFRF shows an excess compared to the previous estimations by using rest-frame UV lumi…