Astrophysics and Space Science
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Photometric redshifts: spectroscopy AT Δλ / λ ≈ 0.1
Astrophysics and Space Science - Tập 276 - Trang 965-972 - 2001
I discuss the advantages that photometric redshift techniques offer over traditional (spectroscopic) redshift determination methods. It is shown that the former represents the only means we have of studying the faint distant galaxy population as a whole, and that, in its range of applicability, it delivers excellent results that can add to our knowledge of galaxy formation and evolution processes.......
Observations of the Orion Nebula in Hα, [NII] and Hβ lines
Astrophysics and Space Science - Tập 88 - Trang 477-485 - 1982
Monochromatic photographs of the Orion Nebula taken through narrow bandpass interference filters (Δλ=10 Å) centred on Hα, Hβ and [NII] lines are presented. Ratio contours of Hα/[NII] and Hα/Hβ are derived. They enable a detailed study of the point-to-point variation in ionization structure and temperature throughout the nebula. Dust located within the ionized gas is studied from the Hα/Hβ ratio wh......
Erratum to: Anisotropic compact sphere with Van der Waals equation of state
Astrophysics and Space Science - Tập 354 Số 2 - Trang 683-683 - 2014
On properties of coronal mass ejection-solar flare linked events
Astrophysics and Space Science - Tập 366 - Trang 1-6 - 2021
In the present paper, the relation between the CMEs and their linked solar flares is examined during the entire solar cycle 23. During this solar cycle and under certain temporal and spatial conditions, 521 CMEs linked with solar flares are selected. These selected CMEs are separated into two groups according to their time of detection, 254 Before Flare-ECME events (BF-CMEs) and 267 After Flare–EC......
Eclipsing binary system AV Hydrae
Astrophysics and Space Science - - 1981
The eclipsing binary AV Hya has been observed photoelectrically inU, B andV filters on 15 nights. The primary eclipse appeared to be total with a totality of 23 min duration. A modified period of 0d.6 834 062 has been obtained. Geometrical elements could only be determined for partial transit case.
ASCA observations of colliding stellar winds in gamma velorum
Astrophysics and Space Science - - 1995
Pulsed and continuous radiation from white dwarfs
Astrophysics and Space Science - Tập 17 - Trang 117-125 - 1972
We demonstrate that the detection of steady kV X-ray emission from the vicinity of a white dwarf star possessing a magnetic field of the order of 107 G will provide strong evidence that the white dwarf is rotating with a period of about one minute. We also show that detection of pulsed radiation at about 1 mm wavelength would confirm this. Also some of the interesting dynamical consequences for th......
Far ultraviolet nighttime ionospheric photometer
Astrophysics and Space Science - Tập 355 - Trang 1-7 - 2014
Far Ultraviolet Nighttime Ionopsheric Photometer (FNIP) is a newly-designed instrument for low earth orbit missions, observing the earth night airglow nadir at OI 135.6 nm emission produced by ionospheric O++e recombination and receiving the horizontal information on nighttime ionosphere with a spatial resolution of about 1.6∘×3.8∘. This simple, highly robust instrument excludes OI 130.4 nm emissi......
Habitable zones and UV habitable zones around host stars
Astrophysics and Space Science - Tập 325 - Trang 25-30 - 2009
Ultraviolet radiation is a double-edged sword to life. If it is too strong, the terrestrial biological systems will be damaged. And if it is too weak, the synthesis of many biochemical compounds cannot go along. We try to obtain the continuous ultraviolet habitable zones, and compare the ultraviolet habitable zones with the habitable zones of host stars. Using the boundary ultraviolet radiation of......
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