2006ApJ...636..214V

Query : 2006ApJ...636..214V

2006ApJ...636..214V - Astrophys. J., 636, 214-239 (2006/January-1)

Oxygen and nitrogen in isolated dwarf irregular galaxies.

VAN ZEE L. and HAYNES M.P.

Abstract (from CDS):

We present long-slit optical spectroscopy of 67 H II regions in 21 dwarf irregular galaxies to investigate the enrichment of oxygen, nitrogen, neon, sulfur, and argon in low-mass galaxies. Oxygen abundances are obtained via direct detection of the temperature-sensitive emission lines for 25 H II regions; for the remainder of the sample, oxygen abundances are estimated from strong-line calibrations. The direct abundance determinations are compared to the strong-line abundance calibrations of both McGaugh and Pilyugin. While the McGaugh calibration yields a statistical offset of 0.07 dex, the photoionization model grid traces the appropriate isometallicity contour shape in the R₂₃-O₃₂diagnostic diagram. In contrast, while the Pilyugin calibration yields a negligible statistical offset, the residuals in this strong-line calibration method are correlated with ionization parameter. Thus, these observations indicate that oxygen abundances will be overestimated by the p-method for H II regions with low-ionization parameters. Global oxygen and nitrogen abundances for this sample of dwarf irregular galaxies are examined in the context of open- and closed-box chemical evolution models. While several galaxies are consistent with closed-box chemical evolution, the majority of this sample has an effective yield ~(1)/(4) of the expected yield for a constant star formation rate and Salpeter IMF, indicating that either outflow of enriched gas or inflow of pristine gas has occurred. The effective yield strongly correlates with M_H/L_Bin the sense that gas-rich galaxies are more likely to be closed systems. However, the effective yield does not appear to correlate with other global parameters such as dynamical mass, absolute magnitude, star formation rate, or surface brightness. In addition, open and closed systems are not identified easily in other global abundance measures; for example, the observed correlation between luminosity and metallicity is consistent with other recent results in the literature. A correlation is found between the observed nitrogen-to-oxygen ratio and the color of the underlying stellar population; redder dwarf irregular galaxies have higher N/O ratios than blue dwarf irregular galaxies. The relative abundance ratios are interpreted in the context of delayed release of nitrogen and varied star formation histories.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Dwarf - Galaxies: Evolution - Galaxies: Irregular - ISM: H II Regions

VizieR on-line data: <Available at CDS (J/ApJ/636/214): table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat>

Nomenclature: Table 5: [VH2006] UGC NNNNN A +XXX+YYY, [VH2006] Z 7-25 A +XXX+YYY, [VH2006] UGCA 292 A +XXX+YYY, [VH2006] HKK L14 A +XXX+YYY, N=67.

Simbad objects: 108

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Number of rows : 108

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	[VH2006] UGC 12894 A -006-005	HII	00 00 21.7	+39 29 42						~	1	0
2	[VH2006] UGC 12894 A +004-004	HII	00 00 22.5	+39 29 43						~	1	0
3	UGC 12894	G	00 00 22.55	+39 29 43.5		17				~	36	0
4	[VH2006] UGC 12894 A +018-004	HII	00 00 23.8	+39 29 43						~	1	0
5	Z 434-1	AG?	00 20 05.20	+10 52 48.0		15.6				~	87	1
6	[VH2006] UGC 290 A -006+006	HII	00 29 07.5	+15 54 09						~	1	0
7	[VH2006] UGC 290 A +006-006	HII	00 29 08.3	+15 53 57						~	1	0
8	UGC 290	AG?	00 29 08.37	+15 53 56.8		18				~	54	0
9	MCG+00-02-062	AG?	00 30 04.10	+03 30 47.0		18				~	38	0
10	Z 435-14	AG?	00 51 12.2110178784	+12 01 31.222059888	15.72	15.38	15.03	14.86		~	47	0
11	Z 410-23	LSB	01 01 25.171	+07 37 33.57		15.7				~	84	0
12	[VH2006] UGC 685 A +000+001	HII	01 07 22.4	+16 41 05						~	1	0
13	[VH2006] UGC 685 A +006-011	HII	01 07 22.8	+16 40 53						~	2	0
14	[VH2006] UGC 685 B +006-011	HII	01 07 22.8	+16 40 53						~	2	0
15	Z 458-20	AG?	01 07 23.0321	+16 41 00.988	15.01	14.55	14.07			~	148	0
16	[VH2006] UGC 685 B +012-004	HII	01 07 23.2	+16 41 00						~	1	0
17	Z 436-33	AG?	01 21 18.90	+12 24 43.0	15.36	14.82	14.36	12.87		~	112	0
18	Z 460-6	AG?	01 32 42.5190557016	+18 19 01.514434548	15.03	14.56	14.13	13.89		~	101	0
19	[VH2006] UGC 1104 B +002+007	HII	01 32 42.6	+18 19 08						~	2	0
20	[VH2006] UGC 1104 B +004-001	HII	01 32 42.7	+18 19 00						~	2	0
21	[VH2006] UGC 1104 A +004-001	HII	01 32 42.7	+18 19 00						~	1	0
22	[VH2006] UGC 1175 A -004+007	HII	01 39 56.2	+11 05 54						~	1	0
23	[VH2006] UGC 1175 A -002-001	HII	01 39 56.4	+11 05 46						~	1	0
24	UGC 1175	LSB	01 39 56.45832	+11 05 49.8336		17				~	32	0
25	[VH2006] UGC 1175 A +000-007	HII	01 39 56.5	+11 05 40						~	1	0
26	UGCA 20	bCG	01 43 14.6	+19 58 51		16				~	55	0
27	Z 503-26	LSB	01 49 31.71	+32 35 16.2		13.0				~	171	0
28	[VH2006] UGC 1281 A +008+013	HII	01 49 32.0	+32 35 30						~	1	0
29	LEDA 166065	LSB	02 00 10.2	+28 49 53		17.2				~	67	0
30	[VH2006] HKK L14 A +002-004	HII	02 00 10.3	+28 49 43						~	1	0
31	[VH2006] UGC 2023 A -036-010	HII	02 33 15.7	+33 29 19						~	1	0
32	[VH2006] UGC 2023 C -029+023	HII	02 33 16.3	+33 29 52						~	1	0
33	[VH2006] UGC 2023 B -028+023	HII	02 33 16.4	+33 29 52						~	1	0
34	[VH2006] UGC 2023 C -020+023	HII	02 33 17.0	+33 29 52						~	1	0
35	[VH2006] UGC 2023 B -014+024	HII	02 33 17.5	+33 29 53						~	1	0
36	[VH2006] UGC 2023 C -013+022	HII	02 33 17.6	+33 29 51						~	1	0
37	[VH2006] UGC 2023 B -008+025	HII	02 33 18.0	+33 29 54						~	2	0
38	[VH2006] UGC 2023 C -006+022	HII	02 33 18.1	+33 29 51						~	2	0
39	Z 505-6	GiG	02 33 18.20	+33 29 28.0		14.9		13.59		~	91	0
40	[VH2006] UGC 2023 C +028+020	HII	02 33 20.8	+33 29 49						~	1	0
41	UGC 2684	AG?	03 20 23.71	+17 17 45.1		18				~	78	0
42	UGC 2984	LSB	04 13 12.403	+13 25 19.10		17				~	54	0
43	MCG+00-13-014	GiC	04 48 34.50	+00 14 30.0		14.7		13.9	14.4	~	68	0
44	[VH2006] UGC 3647 A -006-018	HII	07 04 49.3	+56 30 52						~	2	0
45	[VH2006] UGC 3647 A +004+002	HII	07 04 50.5	+56 31 12						~	1	0
46	[VH2006] UGC 3647 A +006+006	HII	07 04 50.7	+56 31 16						~	1	0
47	MCG+09-12-027	AG?	07 04 50.94	+56 31 13.8		16.0				~	39	0
48	[VH2006] UGC 3672 A -052+091	HII	07 06 23.3	+30 20 52						~	1	0
49	UGC 3672	AG?	07 06 27.336	+30 19 23.61		17				~	43	0
50	[VH2006] UGC 4117 A -011+017	HII	07 57 25.0	+35 56 42						~	1	0
51	[VH2006] UGC 4117 B -001+008	HII	07 57 25.8	+35 56 33						~	1	0
52	Z 178-8	AG?	07 57 25.948	+35 56 22.05		15.5				~	33	0
53	[VH2006] UGC 4117 B +012+003	HII	07 57 26.9	+35 56 28						~	1	0
54	[VH2006] UGC 4483 A -001+016	HII	08 37 02.8	+69 46 52						~	1	0
55	Z 331-51	GiG	08 37 03.00	+69 46 31.0	15.70	15.46	14.98	14.89		~	316	0
56	[VH2006] UGC 4483 A +001-006	HII	08 37 03.2	+69 46 30						~	1	0
57	[VH2006] Z 7-25 A -008+007	HII	09 44 01.6	-00 38 25						~	2	0
58	[VH2006] Z 7-25 A -004+000	HII	09 44 01.8	-00 38 33						~	1	0
59	Z 7-25	Sy1	09 44 01.8742171440	-00 38 31.993352700		15.5				~	89	0
60	[VH2006] Z 7-25 A +000-009	HII	09 44 02.1	-00 38 42						~	2	0
61	[VH2006] UGC 5288 A -007+010	HII	09 51 16.5	+07 49 50				19.31		~	2	0
62	[VH2006] UGC 5288 A -004+006	HII	09 51 16.7	+07 49 46						~	1	0
63	[VH2006] UGC 5288 A +000+000	HII	09 51 17.0	+07 49 40						~	1	0
64	UGC 5288	PaG	09 51 17.241	+07 49 32.05	15.07	14.65	14.18	13.99		~	95	0
65	[VH2006] UGC 5288 B +006-013	HII	09 51 17.4	+07 49 27						~	1	0
66	[VH2006] UGC 5288 A +023-034	HII	09 51 18.6	+07 49 06						~	1	0
67	[VH2006] UGC 5288 C +026-033	HII	09 51 18.7	+07 49 07						~	1	0
68	Z 153-10	G	09 59 26.46	+30 44 47.0	14.08	13.54	13.26	13.33		~	652	0
69	UGC 5716	AG?	10 31 43.26364	+25 18 27.3731		17				~	82	0
70	Z 154-31	AG?	10 36 43.1428583040	+31 32 50.189204040		15.6		15.04		~	121	0
71	Z 184-6	AG?	10 42 42.787	+34 26 57.39		13.31	13.09	12.84	12.85	~	173	0
72	[VH2006] UGCA 292 C +004+013	HII	12 38 40.0	+32 46 02						~	1	0
73	NAME CVn I dwA	GiC	12 38 40.06	+32 46 00.5	16.91	16.66	16.73	16.62		~	242	0
74	[VH2006] UGCA 292 C +008+012	HII	12 38 40.3	+32 46 01						~	2	0
75	[VH2006] UGCA 292 C +026+004	HII	12 38 41.8	+32 45 53						~	1	0
76	[VH2006] UGCA 292 D +035-003	HII	12 38 42.5	+32 45 46						~	1	0
77	[VH2006] UGCA 292 C +038+000	HII	12 38 42.7	+32 45 49						~	1	0
78	NGC 4789A	GiC	12 54 05.248	+27 08 58.67	14.37	14.23	13.95	13.84		~	614	1
79	Z 71-87	H2G	12 58 40.1930636208	+14 13 00.739589628	15.24	15.16	14.98	14.81		~	475	0
80	UGCA 357	AG?	13 26 13.800	+37 46 14.67		17				~	27	0
81	Z 218-34	AG?	13 39 53.75	+40 44 25.3	15.37	14.56	14.20	14.10		~	165	0
82	NGC 5253	rG	13 39 55.990	-31 38 24.11	11.48	10.94	10.49	10.33	13.47	~	1421	4
83	[VH2006] UGC 8651 A +045+036	HII	13 39 57.0	+40 44 56						~	1	0
84	Z 133-19	AG?	14 15 57.0834	+23 03 29.871	15.40	14.77	14.41	14.32		~	296	0
85	Z 247-26	AG?	14 24 43.21	+44 31 41.8	14.24	13.54	13.17	13.07		~	217	0
86	[VH2006] UGC 9240 A +004-037	HII	14 24 44.2	+44 30 57		18				~	2	0
87	Z 163-86	bCG	14 36 08.833	+28 26 58.98		15.4				~	53	0
88	Z 319-21	AG?	15 41 47.85	+67 15 15.3	15.71	15.22	14.81	14.44		~	93	0
89	[VH2006] UGC 9992 A +007+010	HII	15 41 48.9	+67 15 24						~	1	0
90	[VH2006] UGC 9992 A +011-003	HII	15 41 49.6	+67 15 11						~	2	0
91	[VH2006] UGC 9992 A +013-012	HII	15 41 49.9	+67 15 02						~	1	0
92	[VH2006] UGC 10445 B -034+053	HII	16 33 45.0	+28 59 58						~	1	0
93	[VH2006] UGC 10445 A -026-002	HII	16 33 45.6	+28 59 03						~	1	0
94	[VH2006] UGC 10445 B -025+050	HII	16 33 45.7	+28 59 55						~	1	0
95	[VH2006] UGC 10445 B -019+048	HII	16 33 46.2	+28 59 53						~	1	0
96	[VH2006] UGC 10445 B -015+047	HII	16 33 46.5	+28 59 52						~	1	0
97	[VH2006] UGC 10445 B -010+045	HII	16 33 46.8	+28 59 50						~	1	0
98	Z 168-21	SBG	16 33 47.1783414768	+28 59 01.521191184		13.30	13.96			~	140	1
99	[VH2006] UGC 10445 A -003+010	HII	16 33 47.4	+28 59 15						~	1	0
100	[VH2006] UGC 11755 A -003+003	HII	21 29 59.4	+02 24 54						~	1	0
101	[VH2006] UGC 11755 A -001+000	HII	21 29 59.5	+02 24 51						~	1	0
102	NGC 7077	AG?	21 29 59.634	+02 24 51.75	14.05	14.25	13.67	13.23	12.86	~	106	0
103	MCG+02-55-015	LSB	21 49 28.40	+14 13 52.0		17				~	73	0
104	[VH2006] UGC 12713 A -009-003	HII	23 38 13.7	+30 42 28						~	1	0
105	[VH2006] UGC 12713 B -009-003	HII	23 38 13.7	+30 42 28						~	1	0
106	[VH2006] UGC 12713 A -001-003	HII	23 38 14.3	+30 42 28						~	2	0
107	[VH2006] UGC 12713 B +004+004	HII	23 38 14.7	+30 42 35						~	1	0
108	Z 497-44	AG?	23 38 14.758	+30 42 33.24		15.1				~	57	0

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