Search Publications
Rogue wave in Titan's atmosphere
Moslem, W. M.; El-Labany, S. K.; El-Bedwehy, N. A. +2 more
Rogue wave in a collisionless, unmagnetized electronegative plasma is investigated. For this purpose, the basic set of fluid equations is reduced to the Korteweg-de Vries (KdV) equation. However, when the frequency of the carrier wave is much smaller than the ion plasma frequency then the KdV equation is also used to study the nonlinear evolution …
Asymptotic Giant Branch variables in the Galaxy and the Local Group
Whitelock, Patricia A.
AGB variables, particularly the large amplitude Mira type, are a vital step on the distance scale ladder. They will prove particularly important in the era of space telescopes and extremely large ground-based telescopes with adaptive optics, which will be optimized for infrared observing. Our current understanding of the distances to these stars i…
Observation of standing kink waves in solar spicules
Zhelyazkov, I.; Zaqarashvili, T. V.; Ebadi, H.
We analyze the time series of Ca II H-line obtained from Hinode/SOT on the solar limb. The time-distance analysis shows that the axis of spicule undergos quasi-periodic transverse displacement at different heights from the photosphere. The mean period of transverse displacement is ∼180 s and the mean amplitude is 1 arc sec. Then, we solve the disp…
WR 38/38a and the ratio of total-to-selective extinction in Carina
Turner, David G.
A reanalysis of the (seemingly very distant) open cluster Shorlin 1, the group of stars associated with WR 38 and WR 38a, is made on the basis of existing UBV and JHKs observations for cluster members. The 2MASS observations, in particular, imply a mean cluster reddening of EB‑V=1.45±0.07 and a distance of 2.94±0.12 kpc. The …
Transiting exoplanets from the CoRoT space mission Resolving the nature of transit candidates for the LRa03 and SRa03 fields
Mazeh, T.; Aigrain, S.; Alonso, R. +47 more
CoRoT is a space telescope which aims at studying internal structure of stars and detecting extrasolar planets. We present here a list of transits detected in the light curves of stars observed by CoRoT in two fields in the anti-center direction: the LRa03 one observed during 148 days from 3 October 2009 to 1 March 2010 followed by the SRa03 one f…
A multiwavelength study of the supernova remnant G296.8-0.3
Combi, J. A.; Martí, J.; Muñoz-Arjonilla, A. J. +3 more
We report XMM-Newton observations of the Galactic supernova remnant G296.8-0.3, together with complementary radio and infrared data. The spatial and spectral properties of the X-ray emission, detected towards G296.8-0.3, was investigated in order to explore the possible evolutionary scenarios and the physical connexion with its unusual morphology …
Tidal dwarf galaxies at intermediate redshifts
Gao, Yu; Zheng, Xian-Zhong; Zhao, Ying-He +1 more
We present the first attempt at measuring the production rate of tidal dwarf galaxies (TDGs) and estimating their contribution to the overall dwarf population. Using HST/ACS deep imaging data from GOODS and GEMS surveys in conjunction with photometric redshifts from COMBO-17 survey, we performed a morphological analysis for a sample of merging/int…
Building the cosmic distance scale: from Hipparcos to Gaia
Turon, Catherine; Luri, Xavier; Masana, Eduard
Hipparcos, the first ever experiment of global astrometry, was launched by ESA (European Space Agency) in 1989 and its results published in 1997 (Perryman et al. in Astron. Astrophys. 323:L49, 1997; Perryman & ESA (eds.) in The Hipparcos and Tycho catalogues, ESA SP-1200, 1997). A new reduction was later performed using an improved satellite a…
Characteristics of DH type II bursts, CMEs and flares with respect to the acceleration of CMEs
Prakash, O.; Shanmugaraju, A.; Vršnak, Bojan +2 more
A detailed investigation on DH-type-II radio bursts recorded in Deca-Hectometer (hereinafter DH-type-II) wavelength range and their associated CMEs observed during the year 1997–2008 is presented. The sample of 212 DH-type-II associated with CMEs are classified into three populations: (i) Group I (43 events): DH-type-II associated CMEs are acceler…
Star formation in the starburst cluster in NGC 3603
Ventura, Paolo; Valenti, Elena; Pang, Xiaoying +7 more
We have used new, deep, visible and near infrared observations of the compact starburst cluster in the giant HII region NGC 3603 and its surroundings with the WFC3 on HST and HAWK-I on the VLT to study in detail the physical properties of its intermediate mass (∼1–3 M⊙) stellar population. We show that after correction for differential …