Search Publications
Absolute magnitude calibration for red clump stars
Bilir, S.; Karaali, S.; Yaz Gökçe, E.
We combined the (Ks, J‑Ks) data in Laney et al. (Mon. Not. R. Astron. Soc. 419:1637, 2012) with the V apparent magnitudes and trigonometric parallaxes taken from the Hipparcos catalogue and used them to fit the
Model of outgrowths in the spiral galaxies NGC 4921 and NGC 7049 and the origin of spiral arms
Carlqvist, Per
NGC 4921 and 7049 are two spiral galaxies presenting narrow, distinct dust features. A detailed study of the morphology of those features has been carried out using Hubble Space Telescope archival images. NGC 4921 shows a few but well-defined dust arms midway to its centre while NGC 7049 displays many more dusty features, mainly collected within a…
Similarities and differences in the spectral behavior of W Ser and UX Mon in the ultraviolet
Sanad, M. R.; Bobrowsky, M.
We present ultraviolet spectra of two eclipsing interacting binary systems, W Ser and UX Mon, with good coverage over the 14.16-day and 5.9-day orbital periods, respectively, using observations taken by the International Ultraviolet Explorer (IUE) during the period between 1978–1993 and 1981–1991. Two profiles of W Ser and UX Mon showing variation…
Evidences to the pulse like origin of double spicules based on Hinode/SOT observations
Ebadi, H.
We analyze the time series of Hα line obtained from Hinode/SOT on the solar limb. The wavelet analysis shows that there are nice correlations between dynamical properties of the two parts of a double spicule. The dominant periods for height variations are estimated ∼90 and ∼180 s. The length of two parts of the spicule oscillates with the period o…
New face in the spectral behavior of Capella in the UV
Sanad, M. R.
We present low and high resolution ultraviolet spectra of the Capella spectroscopic binary system from the observations taken by the International Ultraviolet Explorer (IUE) during the period between 1978–1990 and 1978–1995. Thirteen profile of Capella showing variations of line fluxes at different orbital phases are presented. This paper focuses …