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Unveiling the stellar origin of the Wolf-Rayet nebula NGC 6888 through infrared observations
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +5 more
We present a comprehensive infrared (IR) study of the iconic Wolf-Rayet (WR) wind-blown bubble NGC 6888 around WR 136. We use Wide-field Infrared Survey Explorer, Spitzer IRAC, and MIPS and Herschel PACS IR images to produce a sharp view of the distribution of dust around WR 136. We complement these IR photometric observations with Spitzer IRS spe…
An extremely hot white dwarf with a rapidly rotating K-type subgiant companion: UCAC2 46706450
Rebassa-Mansergas, Alberto; Pelisoli, Ingrid; Irawati, Puji +5 more
The subgiant UCAC2 46706450 is a late-type star with an ultraviolet (UV) excess. It was considered as a candidate to establish a sample of stars of spectral type F, G, and K with white dwarf (WD) companions that could be used to test binary evolution models. To verify the WD nature of the companion, UV spectroscopy has previously been performed by…
Evidence for Resonance Scattering in the X-Ray Grating Spectrum of the Supernova Remnant N49
Gu, Liyi; Uchida, Hiroyuki; Tsuru, Takeshi Go +2 more
Resonance scattering (RS) is an important process in astronomical objects, because it affects measurements of elemental abundances and distorts surface brightness of the object. It is predicted that RS can occur in plasmas of supernova remnants (SNRs). Although several authors reported hints of RS in SNRs, no strong observational evidence has been…
Eclipse time variations in the post-common envelope binary V470 Cam
Lynas-Gray, A. E.; Clarke, F.; Bogensberger, D. +1 more
Linear or quadratic relations fitted to the time-dependence of post-common envelope binary eclipse times generally give residuals exhibiting a cyclic variation. Among several possible explanations is the presence of one or more orbiting circumbinary objects causing a reflex motion of the binary centre-of-mass, thereby altering the light-travel-tim…
OB stars and YSO populations in the region of NGC 6334-NGC 6357 as seen with Gaia DR2
Adami, C.; Zavagno, A.; Russeil, D. +3 more
Aims: Our goal is to better understand the origin and the star-formation history of regions NGC 6334 and NGC 6357. We focus our study on the kinematics of young stars (young stellar objects and OB stars) in both regions mainly on the basis of the Gaia DR2 data.
Methods: For both regions, we compiled catalogs of OB stars and young stellar…
Probing Axial Symmetry Breaking in the Galaxy with Gaia Data Release 2
Yanny, Brian; Gardner, Susan; Hinkel, Austin
We study a set of solar neighborhood (d < 3 kpc) stars from Gaia Data Release 2 to determine azimuthal star count differences, I.e., left and right of the line from the Galactic Center (GC) through the Sun - and compare these differences north and south. In this companion paper to Gardner et al., we delineate our procedures to remove false asym…
Suzaku Measurements of Hot Halo Emission at Outskirts for Two Poor Galaxy Groups: NGC 3402 and NGC 5129
Sun, Ming; Dai, Xinyu; Nugent, Jenna M.
We present Suzaku off-center observations of two poor galaxy groups, NGC 3402 and NGC 5129, with temperatures below 1 keV. Through spectral decomposition, we measured their surface brightnesses and temperatures out to 530 and 1430 times the critical density of the universe for NGC 3402 and NGC 5129, respectively. These quantities are consistent wi…
Large-scale changes of the cloud coverage in the ɛ Indi Ba and Bb system
Henning, T.; Lowry, S.; Snodgrass, C. +23 more
We present the results of 14 nights of I-band photometric monitoring of the nearby brown dwarf binary, ɛ Indi Ba and Bb. Observations were acquired over 2 months, with a total of close to 42 h of coverage at a typically high cadence of 1.4 min. At a separation of just 0.7 arcsec, we do not resolve the individual components, and so effectively trea…
Multiwavelength modelling of the circumstellar environment of the massive protostar AFGL 2591 VLA 3
Motte, F.; Beuther, H.; Kuiper, R. +13 more
We have studied the dust density, temperature, and velocity distributions of the archetypal massive young stellar object (MYSO) AFGL 2591. Given its high luminosity ( $L=2\times 10^5\, \mbox{L$_{\odot}$}$ ) and distance (d = 3.3 kpc), AFGL 2591 has one of the highest $\sqrt{L}/d$ ratio, giving better resolved dust emission than any other MYSO. As …
The Capon method for Mercury's magnetic field analysis
Motschmann, Uwe; Toepfer, Simon; Narita, Yasuhito +1 more
Characterization of Mercury's internal and external magnetic field is one of the primary goals of the magnetometer experiment on board the BepiColombo MPO (Mercury Planetary Orbiter) spacecraft. A novel data analysis tool is developed to determine the Gauss coefficients in the multipole expansion using Capon's minimum variance projection method. T…