Galactic Planetary Nebulae and their central stars

Kerber, F.; Mignani, Roberto; Guglielmetti, Fabrizia; Wicenec, A.

doi:10.1051/0004-6361:20031046

Cited by 69 publications

(74 citation statements)

References 14 publications

(12 reference statements)

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“…All the three 4.5 μm excess sources g1, g2, and g4 are located at the edge of the region surveyed with IRAC. Sources g1, g4, and g2 coincide with the positions of three PNe JaST 76 and JaST 70 in Van de Steene & Jacoby (2001) and PN G0.8−0.6 in Kerber et al (2003), respectively. The SEDs of these sources are shown in Figure 16(b).…”

Section: A1 Galactic Center 45 μM Excess Sourcesmentioning

confidence: 71%

Star Formation in the Central 400 Pc of the Milky Way: Evidence for a Population of Massive Young Stellar Objects

Yusef‐Zadeh

Hewitt

Arendt

et al. 2009

ApJ

203

264

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The central kpc of the Milky Way might be expected to differ significantly from the rest of the Galaxy with regard to gasdynamics and the formation of young stellar objects (YSOs). We probe this possibility with midinfrared observations obtained with Infrared Array Camera and Multiband Imaging Photometer on Spitzer and with Midcourse Space Experiment. We use color-color diagrams and spectral energy distribution (SED) fits to explore the nature of YSO candidates (including objects with 4.5 μm excesses possibly due to molecular emission). There is an asymmetry in the distribution of the candidate YSOs, which tend to be found at negative Galactic longitudes; this behavior contrasts with that of the molecular gas, approximately 2/3 of which is at positive longitudes. The small-scale height of these objects suggests that they are within the Galactic center region and are dynamically young. They lie between two layers of infrared dark clouds and may have originated from these clouds. We identify new sites for this recent star formation by comparing the mid-IR, radio, submillimeter, and methanol maser data. The methanol masers appear to be associated with young, embedded YSOs characterized by 4.5 μm excesses. We use the SEDs of these sources to estimate their physical characteristics; their masses appear to range from ∼10 to ∼20 M . Within the central 400 × 50 pc (|l| < 1.• 3 and |b| < 10 ) the star formation rate (SFR) based on the identification of Stage I evolutionary phase of YSO candidates is about 0.14 M yr −1 . Given that the majority of the sources in the population of YSOs are classified as Stage I objects, we suggest that a recent burst of star formation took place within the last 10 5 yr. This suggestion is also consistent with estimates of SFRs within the last ∼10 7 yr showing a peak around 10 5 yr ago. Lastly, we find that the Schmidt-Kennicutt Law applies well in the central 400 pc of the Galaxy. This implies that star formation does not appear to be dramatically affected by the extreme physical conditions in the Galactic center region.

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Section: A1 Galactic Center 45 μM Excess Sourcesmentioning

confidence: 71%

Star Formation in the Central 400 Pc of the Milky Way: Evidence for a Population of Massive Young Stellar Objects

Yusef‐Zadeh

Hewitt

Arendt

et al. 2009

ApJ

203

264

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“…m Milne (1973), converted to J2000.0 coordinates. n Kerber et al (2003). o see Schmidt & Ziurys (2016).…”

Section: K3-58mentioning

confidence: 98%

New Detections of HNC in Planetary Nebulae: Evolution of the [Hcn]/[Hnc] Ratio

Schmidt

Ziurys

2017

ApJ

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“…Acker et al 1992Acker et al , 1996Kohoutek 1994Kohoutek , 2002Zanin et al 1997;Beaulieu et al 1999;Cappellaro et al 2001;Jacoby & Van de Steene 2004;Boumis et al 2003Boumis et al , 2006Górny 2006). As a further check we made use of updated coordinates provided by Kerber et al (2003) and SIMBAD to ensure no objects were missed. Figure 1 depicts the most complete catalogue to date of bulge PNe overlaid on OGLE-III fields.…”

Section: Planetary Nebulae Catalogue Constructionmentioning

confidence: 99%

Binary planetary nebulae nuclei towards the Galactic bulge

Miszalski

Acker

Moffat³

et al. 2009

A&A

215

310

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Binarity has been hypothesised to play an important, if not ubiquitous, role in the formation of planetary nebulae (PNe). Yet there remains a severe paucity of known binary central stars required to test the binary hypothesis and to place strong constraints on the physics of the common-envelope (CE) phase of binary stellar evolution. Large photometric surveys offer an unrivalled opportunity to efficiently discover many binary central stars. We have combined photometry from the OGLE microlensing survey with the largest sample of PNe towards the Galactic bulge to systematically search for new binaries. A total of 21 periodic binaries were found thereby more than doubling the known sample. The orbital period distribution was found to be best described by CE population synthesis models when no correlation between primary and secondary masses is assumed for the initial mass ratio distribution. A comparison with post-CE white dwarf binaries indicates both distributions are representative of the true post-CE period distribution with most binaries exhibiting periods less than one day. A close binary fraction of 12−21% is derived and is the first robust and independent validation of the previous 10−15% estimate. This suggests that binarity is not a precondition for the formation of PNe and that close binaries do not play a dominant role in the shaping of nebular morphologies. Systematic effects and biases of the survey are discussed with implications for future photometric surveys.

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Galactic Planetary Nebulae and their central stars

Cited by 69 publications

References 14 publications

Star Formation in the Central 400 Pc of the Milky Way: Evidence for a Population of Massive Young Stellar Objects

Star Formation in the Central 400 Pc of the Milky Way: Evidence for a Population of Massive Young Stellar Objects

New Detections of HNC in Planetary Nebulae: Evolution of the [Hcn]/[Hnc] Ratio

Binary planetary nebulae nuclei towards the Galactic bulge

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