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  • 1
    Electronic Resource
    Electronic Resource
    Discovery of IR bursts from Liller I/MXB1730–333 (1979)
    [s.l.] : Nature Publishing Group
    Nature 280 (1979), S. 819-820 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Liller1 searched for an optical counterpart of the rapid burster and found a highly reddened compact cluster with a red magnitude rar = 21 in the error box of the rapid burster6. This has been identified as a globular cluster by Kleinmann et al.7, with the help of IR observations. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/280819a0
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  • 2
    Electronic Resource
    Electronic Resource
    Search for the near infrared counterparts to the IRAS sources (1984)
    Springer
    Astrophysics and space science 103 (1984), S. 405-407 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract As part of a program to search for the near infrared counterparts to the far infrared sources discovered by the Infrared Astronomical Satellite (IRAS) we have scanned two areas including the IRAS error boxes for the sources IRAS 0453+444 and IRAS 1717-087 at 2.2 μm down to the flux density limit of ∼1 Jy. Results on the IRAS sources and the detection of two new bright near infrared sources are reported and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00653758
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared Observations of Comet Hale–Bopp (C/1995 O1) from Gurushikhar Observatory (1998)
    Springer
    Earth, moon and planets 81 (1998), S. 111-121 
    Details
    ISSN: 1573-0794
    Keywords: Albedo ; comets ; grains ; Hale—Bopp ; infrared
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract During the recent apparition of comet Hale—Bopp (1995 O1) near infrared photometric observations were carried out in the J, H, K filter bands and also in the 3.0—3.4 μm region at the 1.2 m telescope at Gurushikkar, India. The effective temperature of the comet was substantially higher than the equilibrium blackbody temperature. A mean superheat value of 1.83 was derived in the post-perihelion phase which implies that a large fraction of the grain population are made up of small and hot grains with radii 〈0.5 μm. High albedo values of ∼0.4 were also derived in the scattering angle range 135° to 160° which could explain the unusual brightness of comet Hale—Bopp.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006360910022
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  • 4
    Electronic Resource
    Electronic Resource
    A high speed near infrared photometer for lunar occultation studies (1994)
    Springer
    Experimental astronomy 4 (1994), S. 177-188 
    Details
    ISSN: 1572-9508
    Keywords: Lunar occultation ; high speed infrared photometry ; insb dewar ; infrared sky background ; high angular resolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A recently developed near infrared high speed photometer intended for lunar oc-cultation studies is described. The primary scientific objective is to reach milli arc second levels of angular resolution so that circumstellar structure of the occulted sources can be resolved. Near infrared sky brightness close to the lunar limb is also studied. Angular diameter derived from the observed occultation of IRC +20169 is presented and system performance discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01580780
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  • 5
    Electronic Resource
    Electronic Resource
    Twilight IR brightening over India due to EI Chichón's eruption in Mexico (1982)
    [s.l.] : Nature Publishing Group
    Nature 300 (1982), S. 620-621 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Spectacular visual effects in the form of coloured sunsets following violent volcanic eruptions are well known1'2, and the time of fading for the late twilight glow has been interpreted in terms of an aerosol layer in the lower stratosphere by using shadow heights3'4. Colourful displays in the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/300620a0
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  • 6
    Electronic Resource
    Electronic Resource
    Near-infrared observations of the peculiar binary system epsilon Aurigae (1984)
    Springer
    Astrophysics and space science 104 (1984), S. 293-296 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Near-infrared photometric and low-resolution spectroscopic observations of ε Aurigae at two phases during the current eclipse are presented. The eclipse depths are found to be wavelength-independent in the infrared right up to 2.5 μm. There is no infrared excess at wavelengths shorter than 2.5 μm. The light absorbing particles in the eclipsing body must be larger than 10 μm in size.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00650304
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  • 7
    Electronic Resource
    Electronic Resource
    Fabry-Pérot line profiles in the λ5303 å and λ6374 å coronal lines obtained during the 1983 Indonesian eclipse (1991)
    Springer
    Solar physics 131 (1991), S. 25-39 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract During the total solar eclipse of 11 June, 1983, an imaging dual-channel Fabry-Pérot interferometer was used to obtain line profiles simultaneously in the green λ5303 Å [Fe xiv] and the red λ6374 Å [Fe x] coronal lines at various positions in the corona. Extensive microdensitometry followed by multi-Gaussian curve-fitting analysis has resulted in the determination of coronal temperatures and velocity separations between different pockets of coronal gas in the line of sight over a large extent of the corona. Fewer high temperature zones are to be found in the corona of 1983 compared with our similar green-line measurements of the solar maximum corona of 1980. The data are consistent with a temperature maximum occurring at 1.2 R ⊙, as found at the 1980 eclipse, but our new data are insufficient to observe farther out than this radius and so determine the position of a maximum. The velocity field in the corona at the 1983 eclipse is less structured compared with that at the 1980 eclipse and is mainly confined to the zone 20–30km s−1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151741
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  • 8
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    Infrared studies of Nova Scorpii 2014: an outburst in a symbiotic system sans an accompanying blast wave (2015)
    Oxford University Press
    Details
    Publication Date: 2015-08-08
    Description: Near-IR (NIR) spectroscopy is presented for Nova Scorpii 2014. It is shown that the outburst occurred in a symbiotic binary system – an extremely rare configuration for a classical nova outburst to occur in but appropriate for the eruption of a recurrent nova of the T CrB class. We estimate the spectral class of secondary as M5III ± (two sub-classes). The maximum magnitude versus rate of decline relations give an unacceptably large value of 37.5 kpc for the distance. The spectra are typical of the He/N class of novae with strong He  i and H lines. The profiles are broad and flat topped with full width at zero intensities approaching 9000–10 000 km s –1 and also have a sharp narrow component superposed which is attributable to emission from the giant's wind. Hot shocked gas, accompanied by X-rays and -rays, is expected to form when the high-velocity ejecta from the nova ploughs into the surrounding giant wind. Although X-ray emission was observed no -ray emission was reported. It is also puzzling that no signature of a decelerating shock is seen in the NIR, seen in similar systems like RS Oph, V745 Sco and V407 Cyg, as rapid narrowing of the line profiles. The small outburst amplitude and the giant secondary strongly suggest that Nova Sco 2014 could be a recurrent nova.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 9
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    Near-infrared studies during maximum and early decline of Nova Cephei 2014 and Nova Scorpii 2015 (2015)
    Oxford University Press
    Details
    Publication Date: 2015-10-03
    Description: We present multiepoch near-infrared photospectroscopic observations of Nova Cephei 2014 and Nova Scorpii 2015, discovered in outburst on 2014 March 8.79 ut and 2015 February 11.84 ut , respectively. Nova Cep 2014 shows the conventional NIR characteristics of a Fe ii class nova characterized by strong C i , H i and O i lines, whereas Nova Sco 2015 is shown to belong to the He/N class with strong He i , H i and O i emission lines. The highlight of the results consists in demonstrating that Nova Sco 2015 is a symbiotic system containing a giant secondary. Leaving aside the T CrB class of recurrent novae, all of which have giant donors, Nova Sco 2015 is shown to be only the third classical nova to be found with a giant secondary. The evidence for the symbiotic nature is threefold; first is the presence of a strong decelerative shock accompanying the passage of the nova's ejecta through the giant's wind, second is the H α excess seen from the system and third is the spectral energy distribution of the secondary in quiescence typical of a cool late-type giant. The evolution of the strength and shape of the emission line profiles shows that the ejecta velocity follows a power-law decay with time ( t –1.13±0.17 ). A Case B recombination analysis of the H i Brackett lines shows that these lines are affected by optical depth effects for both the novae. Using this analysis, we make estimates for both the novae of the emission measure $n_{\rm e}^2L$ , the electron density n e and the mass of the ejecta.
    Print ISSN: 0035-8711
    Electronic ISSN: 1365-2966
    Topics: Physics
    Published by Oxford University Press
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  • 10
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    Near-infrared studies of the carbon monoxide and dust-forming Nova V5668 Sgr (2015)
    Oxford University Press
    Details
    Publication Date: 2015-11-20
    Description: We present near-infrared (NIR) observations of Nova V5668 Sgr, discovered in outburst on 2015 March 15.634 ut , between 2 and 107 d after outburst. NIR spectral features are used to classify it as a Fe  ii class of nova. The spectra follow the evolution of the spectral lines from a P Cygni stage to a pure emission phase where the shape of the profiles suggests the presence of a bipolar flow. A notable feature is the presence of carbon monoxide first overtone bands which are seen in emission. The CO emission is modelled to make estimates of the mass, temperature and column density to be (0.5–2.0)  x  10 –8 M , 4000 ± 300 K and (0.36–1.94)  x  10 19  cm –2 , respectively. The 12 C/ 13 C ratio is estimated to be ~1.5. V5668 Sgr was a strong dust producer exhibiting the classical deep dip in its optical light curve during dust formation. Analysis of the dust SED yields a dust mass of 2.7  x  10 -7 M , a blackbody angular diameter of the dust shell of 42 mas and a distance estimate to the nova of 1.54 kpc which agrees with estimates made from MMRD relations.
    Print ISSN: 1745-3925
    Electronic ISSN: 1745-3933
    Topics: Physics
    Published by Oxford University Press
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