1 Introduction

Most of the model results for line intensities of H II regions refer to the emission of the whole nebula. However, most of the observational determinations of optical emission line fluxes of galactic H II regions are based on spectroscopic data taken from special and small areas (usually the brightest ones) of the objects. Integrated absolute fluxes in optical emission lines are very scarce in the literature. A recent exception is the abundance study by Deharveng et al. (2000) based on the integrated line fluxes of Caplan et al. (2000). In the present paper, we present integrated photoelectric measurements of the flux and equivalent width of the H$\beta$ emission line, denoted by F(H$\beta$) and $W_{\rm H\beta}$ respectively, and of the [O III]/H$\beta$ ratio, defined as the intensity relative to H$\beta$ of the doublet [O III] $\lambda\lambda4959,5007$ for a sample of 31 southern hemisphere galactic H II regions. For most of these objects, optical absolute fluxes have never been obtained before. Three of them, RCW87, RCW88 and RCW99, are misclassified planetary nebulae (Acker et al. 1987) and other three are Wolf-Rayet nebulae (Chu 1981).

 

 

Table 1: Photometry of 31 galactic H II regions

Object	Other names	$\alpha$(2000)	$\delta$(2000)	aperture	N	$W_{\rm H\beta}$ (Å)	[O III]/H$\beta$	log F(H$\beta$)*
NGC2467	Gum9, RCW16, S311	$07^{\rm h}52^{\rm m}22.1^{\rm s}$	$-26^\circ26\hbox{$^\prime$ }30\hbox{$^{\prime\prime}$ }$	3$^\prime$20 $^{\prime\prime}$	2	368 $\pm$ 131	2.7 $\pm$ 01	-9.87 $\pm$ 0.02
		$07\phantom{^{\rm h}}52\phantom{^{\rm m}}22.1\phantom{^{\rm s}}$	$-26\phantom{^\circ}26\phantom{\hbox{$^\prime$ }}30\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	177 $\pm$ 23	2.8 $\pm$ 0.1	-9.55 $\pm$ 0.01
RCW19	Gum10	$08\phantom{^{\rm h}}15\phantom{^{\rm m}}55.7\phantom{^{\rm s}}$	$-35\phantom{^\circ}34\phantom{\hbox{$^\prime$ }}17\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	30 $\pm$ 12	1.0 $\pm$ 0.3	-10.84 $\pm$ 0.11
NGC2579	Gum11	$08\phantom{^{\rm h}}20\phantom{^{\rm m}}54.8\phantom{^{\rm s}}$	$-36\phantom{^\circ}13\phantom{\hbox{$^\prime$ }}00\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	6	53 $\pm$ 9	5.5 $\pm$ 0.4	-10.72 $\pm$ 0.04
RCW29	Part of Gum13	$08\phantom{^{\rm h}}21\phantom{^{\rm m}}38.8\phantom{^{\rm s}}$	$-42\phantom{^\circ}39\phantom{\hbox{$^\prime$ }}43\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	2	67 $\pm$ 20	2.0 $\pm$ 0.4	-12.05 $\pm$ 0.15
RCW31		$08\phantom{^{\rm h}}23\phantom{^{\rm m}}59.4\phantom{^{\rm s}}$	$-43\phantom{^\circ}01\phantom{\hbox{$^\prime$ }}53\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	6	123 $\pm$ 45	1.0 $\pm$ 0.2	-12.19 $\pm$ 0.05
RCW34	Gum19	$08\phantom{^{\rm h}}56\phantom{^{\rm m}}28.2\phantom{^{\rm s}}$	$-43\phantom{^\circ}05\phantom{\hbox{$^\prime$ }}57\phantom{\hbox{$^{\prime\prime}$ }}$	1$^\prime$40 $^{\prime\prime}$	4	45 $\pm$ 12	1.8 $\pm$ 0.6	-11.45 $\pm$ 0.17
RCW36	Gum20	$08\phantom{^{\rm h}}59\phantom{^{\rm m}}44.9\phantom{^{\rm s}}$	$-43\phantom{^\circ}43\phantom{\hbox{$^\prime$ }}56\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	2	207 $\pm$ 103	0.1 $\pm$ 0.1	-11.76 $\pm$ 0.08
		$08\phantom{^{\rm h}}59\phantom{^{\rm m}}39.2\phantom{^{\rm s}}$	$-43\phantom{^\circ}47\phantom{\hbox{$^\prime$ }}00\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2		0.6 $\pm$ 0.2	-11.88 $\pm$ 0.11
		$08\phantom{^{\rm h}}59\phantom{^{\rm m}}23.5\phantom{^{\rm s}}$	$-43\phantom{^\circ}45\phantom{\hbox{$^\prime$ }}47\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	2	260 $\pm$ 140	0.6 $\pm$ 0.1	-11.91 $\pm$ 0.05
		$08\phantom{^{\rm h}}59\phantom{^{\rm m}}23.1\phantom{^{\rm s}}$	$-43\phantom{^\circ}43\phantom{\hbox{$^\prime$ }}37\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	2	135 $\pm$ 56	0.3 $\pm$ 0.1	-11.80 $\pm$ 0.07
Gum22	Part of RCW38	$08\phantom{^{\rm h}}59\phantom{^{\rm m}}01.0\phantom{^{\rm s}}$	$-47\phantom{^\circ}30\phantom{\hbox{$^\prime$ }}34\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	3		8.2 $\pm$ 1.0	-11.47 $\pm$ 0.06
RCW39		$09\phantom{^{\rm h}}03\phantom{^{\rm m}}21.7\phantom{^{\rm s}}$	$-48\phantom{^\circ}25\phantom{\hbox{$^\prime$ }}49\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	6		1.0 $\pm$ 0.1	-11.63 $\pm$ 0.09
RCW40	Gum25	$09\phantom{^{\rm h}}02\phantom{^{\rm m}}21.0\phantom{^{\rm s}}$	$-48\phantom{^\circ}42\phantom{\hbox{$^\prime$ }}29\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2	92 $\pm$ 21	0.9 $\pm$ 0.1	-10.60 $\pm$ 0.05
		$09\phantom{^{\rm h}}02\phantom{^{\rm m}}26.5\phantom{^{\rm s}}$	$-48\phantom{^\circ}39\phantom{\hbox{$^\prime$ }}48\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2	108 $\pm$ 90	0.7 $\pm$ 0.3	-10.82 $\pm$ 0.16
		$09\phantom{^{\rm h}}02\phantom{^{\rm m}}34.5\phantom{^{\rm s}}$	$-48\phantom{^\circ}37\phantom{\hbox{$^\prime$ }}52\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2	54 $\pm$ 17	0.6 $\pm$ 0.1	-11.11 $\pm$ 0.06
		$09\phantom{^{\rm h}}02\phantom{^{\rm m}}26.0\phantom{^{\rm s}}$	$-48\phantom{^\circ}41\phantom{\hbox{$^\prime$ }}22\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	55 $\pm$ 6	0.7 $\pm$ 0.1	-10.35 $\pm$ 0.05
RCW42	Gum26	$09\phantom{^{\rm h}}24\phantom{^{\rm m}}34.6\phantom{^{\rm s}}$	$-52\phantom{^\circ}00\phantom{\hbox{$^\prime$ }}59\phantom{\hbox{$^{\prime\prime}$ }}$	1$^\prime$40 $^{\prime\prime}$	2	84 $\pm$ 30	5.5 $\pm$ 1.7	-11.96 $\pm$ 0.10
		$09\phantom{^{\rm h}}24\phantom{^{\rm m}}20.1\phantom{^{\rm s}}$	$-51\phantom{^\circ}59\phantom{\hbox{$^\prime$ }}19\phantom{\hbox{$^{\prime\prime}$ }}$	1$^\prime$40 $^{\prime\prime}$	2		5.4 $\pm$ 0.6	-11.61 $\pm$ 0.12
		$09\phantom{^{\rm h}}24\phantom{^{\rm m}}28.9\phantom{^{\rm s}}$	$-51\phantom{^\circ}57\phantom{\hbox{$^\prime$ }}50\phantom{\hbox{$^{\prime\prime}$ }}$	1$^\prime$40 $^{\prime\prime}$	2	28 $\pm$ 10	5.4 $\pm$ 0.6	-11.90 $\pm$ 0.09
NGC3199	Gum28, RCW48	$10\phantom{^{\rm h}}16\phantom{^{\rm m}}27.8\phantom{^{\rm s}}$	$-57\phantom{^\circ}56\phantom{\hbox{$^\prime$ }}02\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	86 $\pm$ 42	11.2 $\pm$ 1.4	-10.23 $\pm$ 0.06
		$10\phantom{^{\rm h}}16\phantom{^{\rm m}}43.3\phantom{^{\rm s}}$	$-57\phantom{^\circ}50\phantom{\hbox{$^\prime$ }}41\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	80 $\pm$ 16	10.9 $\pm$ 1.0	-10.54 $\pm$ 0.05
		$10\phantom{^{\rm h}}16\phantom{^{\rm m}}58.3\phantom{^{\rm s}}$	$-57\phantom{^\circ}58\phantom{\hbox{$^\prime$ }}25\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	2	250 $\pm$ 71	8.9 $\pm$ 0.4	-10.89 $\pm$ 0.03
		$10\phantom{^{\rm h}}16\phantom{^{\rm m}}36.8\phantom{^{\rm s}}$	$-57\phantom{^\circ}57\phantom{\hbox{$^\prime$ }}05\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2		9.5 $\pm$ 0.5	-10.55 $\pm$ 0.03
		$10\phantom{^{\rm h}}16\phantom{^{\rm m}}35.6\phantom{^{\rm s}}$	$-57\phantom{^\circ}52\phantom{\hbox{$^\prime$ }}28\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	191 $\pm$ 74	10.1 $\pm$ 0.8	-10.23 $\pm$ 0.04
RCW49	Gum29	$10\phantom{^{\rm h}}24\phantom{^{\rm m}}09.0\phantom{^{\rm s}}$	$-57\phantom{^\circ}47\phantom{\hbox{$^\prime$ }}23\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2		6.6 $\pm$ 1.0	-10.98 $\pm$ 0.04
		$10\phantom{^{\rm h}}24\phantom{^{\rm m}}15.2\phantom{^{\rm s}}$	$-57\phantom{^\circ}47\phantom{\hbox{$^\prime$ }}27\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2		8.9 $\pm$ 2.1	-10.61 $\pm$ 0.13
RCW52	Gum32	$10\phantom{^{\rm h}}46\phantom{^{\rm m}}11.4\phantom{^{\rm s}}$	$-58\phantom{^\circ}39\phantom{\hbox{$^\prime$ }}15\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	32 $\pm$ 18	0.7 $\pm$ 0.3	-10.69 $\pm$ 0.17
RCW55		$10\phantom{^{\rm h}}56\phantom{^{\rm m}}32.3\phantom{^{\rm s}}$	$-63\phantom{^\circ}00\phantom{\hbox{$^\prime$ }}47\phantom{\hbox{$^{\prime\prime}$ }}$	1$^\prime$40 $^{\prime\prime}$	3	5 $\pm$ 1	0.8 $\pm$ 0.2	-11.95 $\pm$ 0.10
NGC3503	Gum11	$11\phantom{^{\rm h}}01\phantom{^{\rm m}}19.0\phantom{^{\rm s}}$	$-59\phantom{^\circ}50\phantom{\hbox{$^\prime$ }}57\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2	32 $\pm$ 6	4.1 $\pm$ 0.3	-11.42 $\pm$ 0.05
RCW54		$11\phantom{^{\rm h}}02\phantom{^{\rm m}}37.4\phantom{^{\rm s}}$	$-59\phantom{^\circ}53\phantom{\hbox{$^\prime$ }}35\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	2	17 $\pm$ 4	0.9 $\pm$ 0.1	-11.20 $\pm$ 0.06
NGC3603	Gum38b, part of RCW57	$11\phantom{^{\rm h}}15\phantom{^{\rm m}}06.0\phantom{^{\rm s}}$	$-61\phantom{^\circ}16\phantom{\hbox{$^\prime$ }}07\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2	10 $\pm$ 3	14.3 $\pm$ 1.5	-10.89 $\pm$ 0.06
		$11\phantom{^{\rm h}}15\phantom{^{\rm m}}06.0\phantom{^{\rm s}}$	$-61\phantom{^\circ}16\phantom{\hbox{$^\prime$ }}07\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	17 $\pm$ 3	9.2 $\pm$ 0.9	-10.50 $\pm$ 0.03
RCW69	Gum45	$12\phantom{^{\rm h}}44\phantom{^{\rm m}}27.0\phantom{^{\rm s}}$	$-62\phantom{^\circ}31\phantom{\hbox{$^\prime$ }}03\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	2		8.6 $\pm$ 2.9	-12.04 $\pm$ 0.12
RCW87	PK 320+00 1	$15\phantom{^{\rm h}}05\phantom{^{\rm m}}20.1\phantom{^{\rm s}}$	$-57\phantom{^\circ}31\phantom{\hbox{$^\prime$ }}01\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	6	88 $\pm$ 20	1.9 $\pm$ 0.3	-11.81 $\pm$ 0.09
RCW88	PK 320+00 2	$15\phantom{^{\rm h}}07\phantom{^{\rm m}}05.3\phantom{^{\rm s}}$	$-57\phantom{^\circ}47\phantom{\hbox{$^\prime$ }}16\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	4	85 $\pm$ 46	0.5 $\pm$ 0.3	-11.59 $\pm$ 0.10
RCW99	Gum50, PK 328-00 1	$15\phantom{^{\rm h}}59\phantom{^{\rm m}}36.8\phantom{^{\rm s}}$	$-53\phantom{^\circ}45\phantom{\hbox{$^\prime$ }}27\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	4	63 $\pm$ 11	1.8 $\pm$ 0.2	-11.22 $\pm$ 0.04
RCW104		$16\phantom{^{\rm h}}24\phantom{^{\rm m}}07.9\phantom{^{\rm s}}$	$-51\phantom{^\circ}32\phantom{\hbox{$^\prime$ }}07\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	4	31 $\pm$ 6	1.8 $\pm$ 0.4	-11.47 $\pm$ 0.05
RCW105	Gum51	$16\phantom{^{\rm h}}10\phantom{^{\rm m}}39.5\phantom{^{\rm s}}$	$-49\phantom{^\circ}06\phantom{\hbox{$^\prime$ }}20\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	4	61 $\pm$ 16	1.2 $\pm$ 0.2	-11.67 $\pm$ 0.08
		$16\phantom{^{\rm h}}10\phantom{^{\rm m}}32.1\phantom{^{\rm s}}$	$-49\phantom{^\circ}08\phantom{\hbox{$^\prime$ }}26\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	2	56 $\pm$ 21	1.6 $\pm$ 0.4	-11.83 $\pm$ 0.10
RCW110	Part of Gum54	$16\phantom{^{\rm h}}54\phantom{^{\rm m}}22.1\phantom{^{\rm s}}$	$-45\phantom{^\circ}13\phantom{\hbox{$^\prime$ }}27\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	4	71 $\pm$ 40	0.5 $\pm$ 0.2	-11.12 $\pm$ 0.08
		$16\phantom{^{\rm h}}53\phantom{^{\rm m}}54.9\phantom{^{\rm s}}$	$-45\phantom{^\circ}09\phantom{\hbox{$^\prime$ }}48\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	4	29 $\pm$ 8	1.3 $\pm$ 0.3	-11.53 $\pm$ 0.12
RCW111	Part of Gum54	$16\phantom{^{\rm h}}55\phantom{^{\rm m}}07.2\phantom{^{\rm s}}$	$-45\phantom{^\circ}07\phantom{\hbox{$^\prime$ }}15\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	4	51 $\pm$ 8	0.8 $\pm$ 0.1	-11.45 $\pm$ 0.05
RCW120	Gum58, S3	$17\phantom{^{\rm h}}12\phantom{^{\rm m}}27.4\phantom{^{\rm s}}$	$-38\phantom{^\circ}29\phantom{\hbox{$^\prime$ }}53\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2	21 $\pm$ 6	2.3 $\pm$ 0.3	-11.31 $\pm$ 0.06
Gum64a	Part of RCW127, NGC6334, S8	$17\phantom{^{\rm h}}20\phantom{^{\rm m}}03.3\phantom{^{\rm s}}$	$-35\phantom{^\circ}58\phantom{\hbox{$^\prime$ }}25\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	4	273 $\pm$ 62	0.6 $\pm$ 0.1	-11.38 $\pm$ 0.03
Gum64c	Part of RCW127, NGC6334, S8	$17\phantom{^{\rm h}}20\phantom{^{\rm m}}30.6\phantom{^{\rm s}}$	$-35\phantom{^\circ}46\phantom{\hbox{$^\prime$ }}01\phantom{\hbox{$^{\prime\prime}$ }}$	2$^\prime$30 $^{\prime\prime}$	4	121 $\pm$ 10	0.3 $\pm$ 0.1	-11.07 $\pm$ 0.02
NGC6357	Gum66, RCW131, S11	$17\phantom{^{\rm h}}24\phantom{^{\rm m}}47.8\phantom{^{\rm s}}$	$-34\phantom{^\circ}10\phantom{\hbox{$^\prime$ }}16\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	4		4.8 $\pm$ 0.4	-10.80 $\pm$ 0.03
M20	Trifid Nebula, NGC6514	$18\phantom{^{\rm h}}02\phantom{^{\rm m}}23.1\phantom{^{\rm s}}$	$-23\phantom{^\circ}01\phantom{\hbox{$^\prime$ }}59\phantom{\hbox{$^{\prime\prime}$ }}$	3$^\prime$20 $^{\prime\prime}$	2	26 $\pm$ 3	2.2 $\pm$ 0.1	-9.79 $\pm$ 0.02
		$18\phantom{^{\rm h}}02\phantom{^{\rm m}}23.1\phantom{^{\rm s}}$	$-23\phantom{^\circ}01\phantom{\hbox{$^\prime$ }}59\phantom{\hbox{$^{\prime\prime}$ }}$	6$^\prime$40 $^{\prime\prime}$	2	148 $\pm$ 10	1.2 $\pm$ 0.1	-9.12 $\pm$ 0.02

Catalogues: Gum = Gum (1955); PK = Perek & Kohouteck (1967); RCW = Rodgers et al. (1960); S = Sharpless (1959).
^* in erg s^-1 cm^-2.

The [O III]/H$\beta$ ratio is the simplest parameter used to characterise the level of excitation of H II regions, whereas the H$\beta$ flux combined with distance and the amount of extinction estimates give us the total number of ionising photons emitted by the stars per unit time. Copetti et al. (1986) have shown that the age of the ionising cluster of an H II region may be estimated from the equivalent width $W_{\rm H\beta}$.