2014A&A...566A..48G

Query : 2014A&A...566A..48G

2014A&A...566A..48G - Astronomy and Astrophysics, volume 566A, 48-48 (2014/6-1)

Accelerated post-AGB evolution, initial-final mass relations, and the star-formation history of the Galactic bulge.

GESICKI K., ZIJLSTRA A.A., HAJDUK M. and SZYSZKA C.

Abstract (from CDS):

We study the star-formation history of the Galactic bulge, as derived from the age distribution of the central stars of planetary nebulae that belong to this stellar population. The high resolution imaging and spectroscopic observations of 31 compact planetary nebulae are used to derive their central star masses. We use the Bloecker post asymptotic giant branch (post-AGB) evolutionary models, which are accelerated by a factor of three in this case to better fit the white dwarf mass distribution and asteroseismological masses. Initial-final mass relations (IFMR) are derived using white dwarfs in clusters. These are applied to determine original stellar masses and ages. The age distribution is corrected for observational bias as a function of stellar mass. We predict that there are about 2000 planetary nebulae in the bulge. The planetary nebula population points at a young bulge population with an extended star-formation history. The Bloecker tracks with the cluster IFMR result in ages, which are unexpectedly young. We find that the Bloecker post-AGB tracks need to be accelerated by a factor of three to fit the local white dwarf masses. This acceleration extends the age distribution. We adjust the IFMR as a free parameter to map the central star ages on the full age range of bulge stellar populations. This fit requires a steeper IFMR than the cluster relation. We find a star-formation rate in the Galactic bulge, which is approximately constant between 3 and 10Gyr ago. The result indicates that planetary nebulae are mainly associated with the younger and more metal-rich bulge populations. The constant rate of star-formation between 3 and 10Gyr agrees with suggestions that the metal-rich component of the bulge is formed during an extended process, such as a bar interaction.

Abstract Copyright: ∼

Journal keyword(s): planetary nebulae: general - stars: AGB and post-AGB - Galaxy: bulge

Simbad objects: 55

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Number of rows : 55
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ACO 43 ClG 00 28 54 +17 34.6           ~ 19 0
2 NGC 246 PN 00 47 03.3420341616 -11 52 18.971126076 10.15 11.52 11.76 12.18   PG1159 475 0
3 Cl Melotte 25 OpC 04 29 47.3 +16 56 53           ~ 3074 0
4 NGC 2168 OpC 06 09 05.3 +24 20 10           ~ 558 0
5 * alf CMa B WD* 06 45 09.3041925037 -16 43 00.724740067   8.41 8.44     DA1.9 544 1
6 PN ARO 121 PN 07 57 51.6169237320 +53 25 16.950484848   16.775 17.128 17.288 17.501 DQ 162 1
7 NGC 2516 OpC 07 58 06.5 -60 48 00           ~ 713 0
8 NGC 2632 OpC 08 40 13.0 +19 37 16           ~ 1564 0
9 PN Lo 4 PN 10 05 45.7880109408 -44 21 33.523482384           sdO 139 1
10 V* GW Vir WD* 12 01 45.9731868264 -03 45 40.628670300   14.87 15.04     DOQZ1 490 0
11 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3425 0
12 PN M 1-19 PN 17 03 46.8491993472 -33 29 44.433527316   15.02 13.87 14.87 14.16 [WC] 70 0
13 PN H 1-8 PN 17 14 42.93 -33 24 47.4     13.6     ~ 60 0
14 PN Th 3-4 PN 17 18 51.9379704912 -31 39 06.630913620           ~ 39 0
15 PN Th 3-6 PN 17 19 20.2424693280 -31 12 40.849468344           ~ 31 0
16 PN M 3-38 PN 17 21 04.4699050536 -29 02 59.700223716     16.00     ~ 92 0
17 PN H 1-9 PN 17 21 31.9113826563 -30 20 48.608058709   16.034 14.636 14.808   ~ 80 0
18 PN M 3-40 PN 17 22 28.2905114736 -27 08 42.369295200           ~ 66 0
19 PN Th 3-12 PN 17 25 06.126 -29 45 16.97           ~ 42 0
20 PN Th 3-14 PN 17 25 44.0827744128 -26 57 47.933915292           ~ 55 0
21 PN M 1-20 PN 17 28 57.6165015264 -19 15 54.033719256           ~ 128 0
22 PN H 1-19 PN 17 30 02.57 -27 59 17.5     16.30     ~ 73 0
23 PN Al 2-F PN 17 30 30.44 -28 35 54.9     17.50     ~ 25 0
24 PN H 2-13 PN 17 31 08.11 -30 10 28.3     16.60   18.501 ~ 44 0
25 WRAY 16-286 PN 17 33 00.67 -36 43 51.8     15.40     ~ 44 0
26 PN H 2-15 PN 17 34 26.817 -22 53 19.71           ~ 62 0
27 PN SaSt 2-15 PN 17 38 57.3713723952 -18 17 35.788016724   13.93 13.66 13.82   ~ 74 0
28 PN H 2-17 PN 17 40 07.4258459184 -24 25 42.592055448     16.00     ~ 79 0
29 PN M 2-14 PN 17 41 57.2678295912 -24 11 16.203074712     14.70 15.71 14.50 ~ 65 0
30 PN H 2-18 PN 17 43 18.3532870822 -21 09 03.245216375         13.816 ~ 78 0
31 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14407 0
32 PN H 2-20 PN 17 45 39.81 -25 40 00.3     17.00     ~ 75 1
33 PN Th 4-1 PN 17 46 20.8184146392 -20 13 48.276182748           ~ 36 0
34 Cl Terzan 5 Cl* 17 48 05.00 -24 46 48.0           ~ 845 1
35 PN H 2-25 PN 17 49 00.481 -23 42 54.59           ~ 62 0
36 PN H 2-26 PN 17 49 50.80 -34 00 30.5     16.30   15.89 ~ 39 0
37 PN H 2-27 PN 17 51 50.5693182432 -33 47 36.313494108           ~ 35 0
38 PN M 1-31 PN 17 52 41.4448424016 -22 21 57.159303984           [WC] 104 0
39 PN A66 43 PN 17 53 32.2767758208 +10 37 24.210757560   14.53 14.71     O7fk 136 0
40 PN H 1-43 PN 17 58 14.4398681232 -33 47 37.621641912     15.10     [WC11] 79 0
41 PN H 1-46 PN 17 59 02.5031407080 -32 21 43.494698556     14.30     ~ 78 0
42 PN H 2-37 PN 18 04 28.874 -28 37 34.55           ~ 52 0
43 PN H 1-55 PN 18 07 14.5591261848 -29 41 24.652100940     16.30     ~ 77 0
44 PN H 2-39 PN 18 08 05.759 -28 26 10.50           ~ 42 0
45 PN KFL 11 PN 18 10 12.244 -27 16 35.00           ~ 31 0
46 PN MaC 1-11 PN 18 14 50.89 -22 43 55.7           ~ 29 0
47 PN K 1-16 PN 18 21 52.1086837968 +64 21 53.406292104   14.44 14.96 15.26   PG1159 250 0
48 NGC 6633 OpC 18 27 22.8 +06 36 54           ~ 385 0
49 NGC 6791 OpC 19 20 53.0 +37 46 41   10.52 9.5     ~ 1040 0
50 NGC 6819 OpC 19 41 18.5 +40 11 24   8.21 7.3     ~ 635 0
51 MWP 1 PN 21 17 08.2817782392 +34 12 27.415995372     12.33     PG1159 186 0
52 NGC 7094 PN 21 36 52.9687364088 +12 47 19.099274136     13.650 13.775   sdB/sdO 194 0
53 PN Jn 1 PN 23 35 53.3214838680 +30 28 06.336745212   15.52 15.62     DOZ 107 0
54 NGC 7789 OpC 23 57 20.2 +56 43 34   7.68 6.7     ~ 528 0
55 NAME Galactic Bulge reg ~ ~           ~ 4297 0

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