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Signature of a chemical spread in the open cluster M37
Salaris, M.; Bedin, L. R.; Pietrinferni, A. +2 more
Recent Gaia photometry of the open cluster M37 has disclosed the existence of an extended main sequence turn-off - like in Magellanic clusters younger than about 2 Gyr - and a main sequence that is broadened in colour beyond what is expected from the photometric errors, at magnitudes well below the region of the extended turn-off, where neither ag…
Analysis of the public HARPS/ESO spectroscopic archive. Jupiter-like planets around HD103891 and HD105779
Mazeh, T.; Zucker, S.; Tal-Or, L. +3 more
Aims: We use the recently published database of radial velocities (RVs) that were derived from fifteen years of HARPS/ESO observations to search for planet candidates.
Methods: For targets with sufficient RV data, we applied an automated algorithm to identify significant periodic signals and fit a Keplerian model for orbital estimates. W…
Ice Features of Low-luminosity Protostars in Near-infrared Spectra of AKARI/IRC
Choi, Minho; Lee, Jeong-Eun; Dunham, Michael M. +8 more
We present near-infrared spectra of three low-luminosity protostars and one background star in the Perseus molecular cloud, acquired using the infrared camera on board the AKARI space telescope. For the comparison with different star-forming environments, we also present spectra of the massive protostar AFGL 7009S, where the protostellar envelope …
Calibration of NOMAD on ESA's ExoMars Trace Gas Orbiter: Part 2 - The Limb, Nadir and Occultation (LNO) channel
Vandaele, Ann Carine; Neefs, Eddy; Aoki, Shohei +19 more
The Nadir and Occultation for MArs Discovery (NOMAD) instrument is a 3-channel spectrometer suite on the ESA ExoMars Trace Gas Orbiter. Since April 2018, when the nominal science mission began, it has been measuring the constituents of the Martian atmosphere. NOMAD contains three separate spectrometers, two of which operate in the infrared: the So…
Estimation of Nitrogen-to-Iron Abundance Ratios from Low-Resolution Spectra
Beers, Timothy C.; Lee, Young Sun; Masseron, Thomas +1 more
We present a method to determine nitrogen abundance ratios with respect to iron ([N/Fe]) from molecular CN-band features observed in low-resolution (R ∼ 2000) stellar spectra obtained by the Sloan Digital Sky Survey (SDSS) and the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). Various tests are carried out to check the systema…
Collisional evolution of the trans-Neptunian region in an early dynamical instability scenario
Vincent, Jean-Baptiste; Campo Bagatin, Adriano; Benavidez, Paula G. +2 more
Any early or late dynamical instability in the outer Solar system should have left their footprint on the trans-Neptunian object (TNO) populations. Here, we study the collisional and dynamical evolution of such populations numerically by an updated version of ALICANDEP, which suitably takes into account the onset of an early dynamical instability.…
A Multiwavelength Study of the Sgr B Region: Contiguous Cloud-Cloud Collisions Triggering Widespread Star Formation Events?
Fukui, Yasuo; Enokiya, Rei
The Sgr B region, including Sgr B1 and Sgr B2, is one of the most active star-forming regions in the Galaxy. Hasegawa et al. originally proposed that Sgr B2 was formed by a cloud-cloud collision (CCC) between two clouds with velocities of ~45 km s-1 and ~75 km s-1. However, some recent observational studies conflict with this…
Call and Response: A Time-resolved Study of Chromospheric Evaporation in a Large Solar Flare
Milligan, Ryan O.; McAteer, R. T. James; Sellers, Sean G.
We studied an X1.6 solar flare produced by NOAA Active Region 12602 on 2014 October 22. The entirety of this event was covered by RHESSI, IRIS, and Hinode/EIS, allowing analysis of the chromospheric response to a nonthermal electron driver. We derived the energy contained in nonthermal electrons via RHESSI spectral fitting and linked the time-depe…
Populations of highly variable X-ray sources in the XMM-Newton slew survey
Saxton, R. D.; Yuan, Weimin; Starling, R. L. C. +2 more
We present the identifications of a flux-limited sample of highly variable X-ray sources on long time-scales from the second catalogue of the XMM-Newton SLew survey (XMMSL2). The carefully constructed sample, comprising 265 sources (2.5 per cent) selected from the XMMSL2 clean catalogue, displayed X-ray variability of a factor of more than 10 in 0…
Radial distribution of plasma at comet 67P. Implications for cometary flyby missions
Henri, P.; Edberg, N. J. T.; Vigren, E. +3 more
Context. The Rosetta spacecraft followed comet 67P/Churyumov-Gerasimenko (67P) for more than two years at a slow walking pace (~1 m s−1) within 1500 km from the nucleus. During one of the radial movements of the spacecraft in the early phase of the mission, the radial distribution of the plasma density could be estimated, and the ionosp…