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Dust and gas environment of the young embedded cluster IRAS 18511+0146
Testi, L.; Walmsley, C. M.; Vig, S. +2 more
Context. Since massive and intermediate mass stars form in clusters, a comparative investigation of the environments of the young embedded cluster members can reveal significant information about the conditions under which stars form and evolve.
Aims: IRAS 18511+0146 is a young embedded (proto)cluster located at 3.5 kpc surrounding what appea…
Absolute Dimensions of the F-type Eclipsing Binary V2154 Cygni
Torres, Guillermo; Bright, Jane C.
We report spectroscopic observations of the 2.63 day, detached, F-type main-sequence eclipsing binary V2154 Cyg. We use our observations together with existing uvby photometric measurements to derive accurate absolute masses and radii for the stars that are good to better than 1.5%. We obtain masses of {M}1=1.269+/- 0.017 {M}⊙
A three-dimensional orbit for the binary star Alpha Andromedae
Branham, Richard L., Jr.
Stars that are both spectroscopic and optical binaries present a means to determine simultaneously the masses of the components and the distance of the system independent of trigonometric parallax. Alpha Andromedae (Alpheratz) represents such a system and, moreover, the primary is the brightest of the mercury-manganese stars. An orbit, based on 42…
SG1120-1202: Mass-quenching as Tracked by UV Emission in the Group Environment at z=0.37
Tran, Kim-Vy H.; Gonzalez, Anthony H.; Monroe, Jonathan T.
We use the Hubble Space Telescope to obtain WFC3/F390W imaging of the supergroup SG1120-1202 at z=0.37, mapping the UV emission of 138 spectroscopically confirmed members. We measure total (F390W-F814W) colors and visually classify the UV morphology of individual galaxies as “clumpy” or “smooth.” Approximately 30% of the members have pockets of UV…
Detection of helicoidal motion in the optical jet of PKS 0521-365
Jiménez-Andrade, E. F.; Falomo, R.; Chavushyan, V. +5 more
The jet activity of active galactic nuclei (AGNs), and its interaction with the interstellar medium, may play a pivotal role in the processes that regulate the growth and star formation of its host galaxy. Observational evidence that pinpoints the conditions of such interaction is paramount to unveil the physical processes involved. We report on t…
Shock-Cloud Interaction in the Solar Corona
Takahashi, Takuya
Flare-associated coronal shock waves sometimes interact with solar prominences, leading to large-amplitude prominence oscillations (LAPOs). Such prominence activation gives us a unique opportunity to track the time evolution of shock-cloud interaction in cosmic plasmas. Although the dynamics of interstellar shock-cloud interaction has been extensi…
Age of the magnetically active WW Psa and TX Psa members of the β Pictoris association
Messina, S.; Petrucci, R.; Jofré, E. +6 more
Context. There are a variety of different techniques available to estimate the ages of pre-main-sequence stars. Components of physical pairs, thanks to their strict coevality and the mass difference, such as the binary system analyzed in this paper, are best suited to test the effectiveness of these different techniques.
Aims: We consider the…
On the attempts to measure water (and other volatiles) directly at the surface of a comet
Sheridan, S.; Wright, I. P.; Barber, S. J. +2 more
The Ptolemy instrument on the Philae lander (of the Rosetta space mission) was able to make measurements of the major volatiles, water, carbon monoxide and carbon dioxide, directly at the surface of comet 67P/Churyumov-Gerasimenko. We give some background to the mission and highlight those instruments that have already given insights into the noti…
A test field for Gaia. Radial velocity catalogue of stars in the South Ecliptic Pole
Meisenheimer, K.; Gosset, E.; Boudreault, S. +25 more
Context. Gaia is a space mission that is currently measuring the five astrometric parameters, as well as spectrophotometry of at least 1 billion stars to G = 20.7 mag with unprecedented precision. The sixth parameter in phase space (I.e., radial velocity) is also measured thanks to medium-resolution spectroscopy that is being obtained for the 150 …
The Discovery and Origin of a Very High-velocity Cloud Toward M33
Peek, J. E. G.; Zheng, Y.; Putman, M. E. +1 more
We report the detection of a largely ionized very high-velocity cloud (VHVC; vLSR∼ -350 km s-1) toward M33 with the Hubble Space Telescope/Cosmic Origin Spectrograph. The VHVC is detected in O I, C II, Si II, and Si III absorption along five sightlines separated by ∼ 0.06-0.4°. On sub-degree scales, the velocities and ionic c…