A New Planetary Nebula

Capellaro, E.; Turatto, M.; Sabbadin, F.

doi:10.1007/978-94-009-0865-9_19

Cited by 8 publications

(12 citation statements)

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“…The source is located in region VIII, close to region IV, in the IRAS color-color diagram (Van der Veen & Habing 1988 Capellaro et al (1990). They mention an optical diameter of 14 , in agreement with our measurement.…”

Section: Notes On Individual Objectssupporting

confidence: 89%

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Optical observations of planetary nebula candidates from the northern hemisphere

Steene¹,

Jacoby²,

Pottasch³

1996

Astron. Astrophys. Suppl. Ser.

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Abstract. -We present Hα+ [N ii] images of 17 and low resolution spectra of 14 IRAS-selected planetary nebula candidates. The Hα+ [N ii] images are presented as finding charts. Contour plots are shown for the resolved planetary nebulae. From these images accurate optical positions and mean optical angular diameters were determined. Optical spectra show that the IRAS-selected and radio detected planetary nebula candidates are indeed planetary nebulae. Three planetary nebula candidates, previously not detected in the radio continuum were seen in Hα. They are larger, low surface brightness planetary nebulae. Most of these IRAS planetary nebulae are heavily extinct, having an average AV of 7 magnitudes. About half of the planetary nebulae seem to be of low excitation, having central stars with an effective temperature probably ∼ 60.000 K or less.

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Section: Notes On Individual Objectssupporting

confidence: 89%

“…For deriving the response curve of the detector, 3 to 4 standard stars were observed each night, except for the first night, when the weather was so bad that we only observed one standard star. iii PN G 43.3+2.2 (Capellaro et al 1990) 4. Discussion…”

Section: Spectroscopymentioning

confidence: 99%

Optical observations of planetary nebula candidates from the northern hemisphere

Steene¹,

Jacoby²,

Pottasch³

1996

Astron. Astrophys. Suppl. Ser.

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“…(Since the distribution of SNRs in the Galaxy is not homogeneous and the distribution of their number density with respect to Galactic radius is not known well, we can not estimate number of the SNRs considerably better). From this result, the formation rate of SNRs turns out to be about one in 65 yr which is approximately the same as the SN explosion rate (van den Bergh & Tammann 1991;Capellaro et al 1999;Capellaro & Turatto 2001). We can use the same approach to estimate the birth rate of PSRs.…”

Section: Discussionsupporting

confidence: 59%

Effects of the background radiation on radio pulsar and supernova remnant searches and the birth rates of these objects

Ankay

Guseinov

Tagieva

2004

Astronomical & Astrophysical Transactions

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“…A number of e †orts to measure the frequency of supernovae (SNe) have been made that include systematic recording of observation times and sensitivities and a relatively well deÐned sample of galaxies (e.g., Muller et al 1992 ;Evans, van den Bergh, & McClure 1989 ;Capellaro & Turatto 1988). These works have all used optical observations, usually in B.…”

Section: Imitations Of Optical Supernova Searchesmentioning

confidence: 99%

“…For this reason, SN rate measurements from optical observations can only be lower limits to the true rate. The SN rate from optical measurements (see the Ðrst section of Table 1) is 0.74È1.6 blue supernova rate units (BSRU), where 1 BSRU \ 1 SN per century per 1010 and is the unit of solar L B,_ L B,_ luminosity measured in the B band (Capellaro & Turatto 1988, for example, refer to this unit as the SNu, but this term can be confused with the solar neutrino unit or SNU from, e.g., Bahcall 1989). A rough estimate of the number of SNe per century in a galaxy similar to our own is about 1 BSRU.…”

Section: Imitations Of Optical Supernova Searchesmentioning

confidence: 99%

An Infrared Search for Extinguished Supernovae in Starburst Galaxies

Grossan

Spillar

Tripp

et al. 1999

The Astronomical Journal

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IR and radio-band observations of heavily extinguished regions in starburst galaxies suggest a high supernova (SN) rate associated with such regions. Optically measured SN rates may therefore underestimate the total SN rate by factors of up to 10, as a result of the very high extinction mag) (A B D 10È20 to core-collapse SNe in starburst regions. The IR/radio SN rates come from a variety of indirect means, however, which su †er from model dependence and other problems. We describe a direct measurement of the SN rate from a regular patrol of starburst galaxies done with K@-band imaging to minimize the e †ects of extinction. A collection of K@-band measurements of core-collapse SNe near maximum light is presented. Such measurements (excluding 1987A) are not well reported in the literature. Results of a preliminary K@-band search, using the MIRC camera at the Wyoming Infrared Observatory and an improved search strategy using the new ORCA optics, are described. A monthly patrol of a sample of IRAS bright (mostly starburst) galaxies within 25 Mpc should yield 1È6 SNe yr~1, corresponding to the range of estimated SN rates. Our initial MIRC search with low resolution pixels) failed to Ðnd (2A .2 extinguished SNe in the IRAS galaxies, limiting the SN rate outside the nucleus (at greater than 15A radius) to less than 3.8 far-IR SN rate units (SNe per century per 1010 measured at 60 and 100 km, L _ or FIRSRU) at 90% conÐdence. The MIRC camera had insufficient resolution to search nuclear starburst regions, where starburst and SN activity is concentrated ; therefore, we were unable to rigorously test the hypothesis of high SN rates in heavily obscured star-forming regions. We conclude that highresolution nuclear SN searches in starburst galaxies with small Ðelds are more productive than lowresolution, large-Ðeld searches, even for our sample of large (often several arcminutes) galaxies. With our ORCA high-resolution optics, we could limit the total SN rate to less than 1.3 FIRSRU at 90% conÐdence in 3 years of observations, lower than most estimates.

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A New Planetary Nebula

Cited by 8 publications

References 0 publications

Optical observations of planetary nebula candidates from the northern hemisphere

Optical observations of planetary nebula candidates from the northern hemisphere

Effects of the background radiation on radio pulsar and supernova remnant searches and the birth rates of these objects

An Infrared Search for Extinguished Supernovae in Starburst Galaxies

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