Search Publications
A new approach to the infrared photometric study of Be stars
Chen, P. S.; Liu, J. Y.; Shan, H. G.
In this paper, we have collected data for almost all Be stars known so far (1991 sources in total) and photometrically study their infrared properties. 2MASS, WISE, IRAS and Akari data are analysed. It is shown from several two-colour diagrams that from 1 to 60 µm, infrared excesses for the majority of Be stars are mainly due to the free-fre…
Cross-correlation analysis of CMB with foregrounds for residuals
Rath, Pranati K.; Aluri, Pavan K.
In this paper, we try to probe whether a clean cosmic microwave background (CMB) map obtained from the raw satellite data using a cleaning procedure is sufficiently clean. Specifically, we study if there are any foreground residuals still present in the cleaned data using a cross-correlation statistic. Residual contamination is expected to be pres…
SZ/X-ray scaling relations using X-ray data and Planck Nominal maps
Atrio-Barandela, F.; De Martino, I.
We determine the relation between the Comptonization parameter predicted using X-ray data YC, Xray and the X-ray luminosity LX, both magnitudes derived from ROSAT data, with the Comptonization parameter YC, SZ measured on Planck 2013 foreground cleaned Nominal maps. The 560 clusters of our sample includes clusters …
Suzaku X-ray observation of the GK Persei dwarf nova outburst in 2015
Ishida, Manabu; Hayashi, Takayuki; Yuasa, Takayuki
The intermediate polar GK Per exhibited a dwarf nova outburst in 2015 March-April. Suzaku X-ray telescope serendipitously captured the onset of the outburst during its pre-scheduled pointing observation spanning four days. In this paper, we present temporal and spectral analysis results of this outburst, together with those from archival data of q…
Constraining the properties of transitional discs in Chamaeleon I with Herschel
Pinte, C.; Duchêne, G.; Bouy, H. +4 more
Transitional discs are protoplanetary discs with opacity gaps/cavities in their dust distribution, a feature that may be linked to planet formation. We perform Bayesian modelling of the three transitional discs SZ Cha, CS Cha, and T25 including photometry from the Herschel Space Observatory to quantify the improvements added by these new data. We …
A revised gyro-age for M67 from Kepler/K2-Campaign-5 light curves
Gonzalez, Guillermo
We revisit the photometric variability of stars in the M67 field using Kepler/K2-Campaign-5 light curves. In our previous work, we limited the search area around M67 to that of a recent ground-based study. In the present work, we expand the search area and apply a more rigorous period-finding algorithm to determine the rotation periods of 98 main-…
No evidence for large-scale outflows in the extended ionized halo of ULIRG Mrk273
Tadhunter, C. N.; Rose, M.; Spoon, H. +4 more
We present deep new Gran Telescopio Canarias (GTC) narrow-band images and William Herschel Telescope (WHT) long-slit spectroscopy of the merging system Mrk273 that show a spectacular extended halo of warm ionized gas out to a radius of ∼45 kpc from the system nucleus. Outside of the immediate nuclear regions (r > 6 kpc), there is no evidence fo…
HELP*: star formation as a function of galaxy environment with Herschel†
Scott, D.; Sargent, M. T.; Buat, V. +15 more
The Herschel Extragalactic Legacy Project (HELP) brings together a vast range of data from many astronomical observatories. Its main focus is on the Herschel data, which maps dust-obscured star formation over 1300 deg2. With this unprecedented combination of data sets, it is possible to investigate how the star formation versus stellar …
Analysis of spatially deconvolved polar faculae
Suematsu, Y.; Shimizu, T.; Ruiz Cobo, B. +2 more
Polar faculae are bright features that can be detected in solar limb observations and they are related to magnetic field concentrations. Although there are a large number of works studying them, some questions about their nature as their magnetic properties at different heights are still open. Thus, we aim to improve the understanding of solar pol…
The first transition Wolf-Rayet WN/C star in M31
Caldwell, Nelson; Iłkiewicz, Krystian; Mikołajewska, Joanna +3 more
Three decades of searches have revealed 154 Wolf-Rayet (WR) stars in M31, with 62 of WC type, 92 of WN type and zero of transition-type WN/C or WC/N. In apparent contrast, about two per cent of the WR stars in the Galaxy, the LMC and M33 simultaneously display strong lines of carbon and nitrogen, I.e. they are transition-type WN/C or WC/N stars. W…