Electron temperatures and densities of IC 2501, Hen 2-7, and PB 4 compared with other works.
| Object . | Temperature (K) from CELs . | . | Temperature (K) from ORLs . | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| . | [O iii] . | [Ar iii] . | [N ii] . | [S ii] . | [O ii] . | [O i] . | . | He i . | O ii . | H i Paschen jump . |
| IC 2501 (This work) | 9350|$^{+390}_{-390}$| | 9250|$^{+250}_{-250}$| | 11 200|$^{+300}_{-300}$| | 12 600|$^{+4500}_{-2600}$| | 11 100|$^{+3340}_{-2340}$| | 9140|$^{+570}_{-450}$| | 9275|$^{+2212}_{-2275}$| | 5748|$^{+1431}_{-1282}$| | 10622 | |
| IC 2501 (Model) | 11 260 | 11 270 | 11 110 | 10 440 | 11 230 | 9742 | ||||
| Milingo et al. (2002b) | 9500 | 11 200 | 11 700 | 10 600 | ||||||
| Sharpee et al. (2007) | 9500|$^{+300}_{-200}$| | 9400|$^{+600}_{-500}$| | 10 800|$^{+900}_{-1100}$| | 12 000 | 13 000 | 6900|$^{+300}_{-200}$| | ||||
| Hen 2-7 (This work) | 13 100|$^{+300}_{-300}$| | 10 700|$^{+400}_{-400}$| | 11 600|$^{+200}_{-200}$| | 13 409|$^{+670}_{-670}$| | 9918|$^{+1190}_{-1190}$| | 6950|$^{+500}_{-500}$| | 7017 | |||
| Hen 2-7 (Model) | 12 604 | 12 408 | 12 068 | 11 803 | 12 676 | 9885 | ||||
| Cuisinier et al. (1996) | 11 700 | 11 800 | ||||||||
| PB 4a (This work) | 10 000|$^{+500}_{-500}$| | 14 600|$^{+3000}_{-2800}$| | >19 000b | 3221|$^{+579}_{-965}$| | 7637 | |||||
| 9500|$^{+1000}_{-1000}{}^d$| | − | 17800|$^{+2000}_{-2000}{}^d$| | ||||||||
| PB 4 (Model) | 11 050 | 11 020 | 11 022 | 11 010 | 11 016 | 11 009 | ||||
| Cuisinier et al. (1996) | 9400 | |||||||||
| Object | Density (cm−3) from CELs | Density (cm−3) from ORLs | ||||||||
| [O ii] | [S ii] | [Cl iii] | [Ar iv] | O ii | N ii | H i Paschen decrement | ||||
| IC 2501 (This work) | 7580|$^{+2590}_{-1690}$| | 8830|$^{+2140}_{-1600}$| | 8380|$^{+480}_{-450}$| | 10700|$^{+2800}_{-2200}$| | 3980c | 1270c | 7874 | |||
| IC 2501 (Model) | 8563 | 8401 | 8553 | 8486 | ||||||
| Milingo et al. (2002b) | 4800 | |||||||||
| Sharpee et al. (2007) | 11 000|$^{+9000}_{-4000}$| | 11 000 | 8500|$^{+2100}_{-1600}$| | 8775|$^{+2150}_{-1600}$| | ||||||
| Hen 2-7 (This work) | 1160|$^{+160}_{-140}$| | 881|$^{+66}_{-61}$| | 1010|$^{+130}_{-110}$| | 1600|$^{+370}_{-360}$| | 1584c | 7997b | ||||
| Hen 2-7 (Model) | 808 | 712 | 807 | 774 | ||||||
| Cuisinier et al. (1996) | 1500 | |||||||||
| PB 4a (This work) | 3091|$^{+1220}_{-676}$| | 2632|$^{+220}_{-200}$| | 1230:|$^{+710}_{-620}$| | |$1916^{+1510}_{-1230}$| | 7080c | 2300c | 1061 | |||
| PB 4 (Model) | 2169 | 1853 | 2126 | |||||||
| Cuisinier et al. (1996) | 3970 | |||||||||
| Object . | Temperature (K) from CELs . | . | Temperature (K) from ORLs . | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| . | [O iii] . | [Ar iii] . | [N ii] . | [S ii] . | [O ii] . | [O i] . | . | He i . | O ii . | H i Paschen jump . |
| IC 2501 (This work) | 9350|$^{+390}_{-390}$| | 9250|$^{+250}_{-250}$| | 11 200|$^{+300}_{-300}$| | 12 600|$^{+4500}_{-2600}$| | 11 100|$^{+3340}_{-2340}$| | 9140|$^{+570}_{-450}$| | 9275|$^{+2212}_{-2275}$| | 5748|$^{+1431}_{-1282}$| | 10622 | |
| IC 2501 (Model) | 11 260 | 11 270 | 11 110 | 10 440 | 11 230 | 9742 | ||||
| Milingo et al. (2002b) | 9500 | 11 200 | 11 700 | 10 600 | ||||||
| Sharpee et al. (2007) | 9500|$^{+300}_{-200}$| | 9400|$^{+600}_{-500}$| | 10 800|$^{+900}_{-1100}$| | 12 000 | 13 000 | 6900|$^{+300}_{-200}$| | ||||
| Hen 2-7 (This work) | 13 100|$^{+300}_{-300}$| | 10 700|$^{+400}_{-400}$| | 11 600|$^{+200}_{-200}$| | 13 409|$^{+670}_{-670}$| | 9918|$^{+1190}_{-1190}$| | 6950|$^{+500}_{-500}$| | 7017 | |||
| Hen 2-7 (Model) | 12 604 | 12 408 | 12 068 | 11 803 | 12 676 | 9885 | ||||
| Cuisinier et al. (1996) | 11 700 | 11 800 | ||||||||
| PB 4a (This work) | 10 000|$^{+500}_{-500}$| | 14 600|$^{+3000}_{-2800}$| | >19 000b | 3221|$^{+579}_{-965}$| | 7637 | |||||
| 9500|$^{+1000}_{-1000}{}^d$| | − | 17800|$^{+2000}_{-2000}{}^d$| | ||||||||
| PB 4 (Model) | 11 050 | 11 020 | 11 022 | 11 010 | 11 016 | 11 009 | ||||
| Cuisinier et al. (1996) | 9400 | |||||||||
| Object | Density (cm−3) from CELs | Density (cm−3) from ORLs | ||||||||
| [O ii] | [S ii] | [Cl iii] | [Ar iv] | O ii | N ii | H i Paschen decrement | ||||
| IC 2501 (This work) | 7580|$^{+2590}_{-1690}$| | 8830|$^{+2140}_{-1600}$| | 8380|$^{+480}_{-450}$| | 10700|$^{+2800}_{-2200}$| | 3980c | 1270c | 7874 | |||
| IC 2501 (Model) | 8563 | 8401 | 8553 | 8486 | ||||||
| Milingo et al. (2002b) | 4800 | |||||||||
| Sharpee et al. (2007) | 11 000|$^{+9000}_{-4000}$| | 11 000 | 8500|$^{+2100}_{-1600}$| | 8775|$^{+2150}_{-1600}$| | ||||||
| Hen 2-7 (This work) | 1160|$^{+160}_{-140}$| | 881|$^{+66}_{-61}$| | 1010|$^{+130}_{-110}$| | 1600|$^{+370}_{-360}$| | 1584c | 7997b | ||||
| Hen 2-7 (Model) | 808 | 712 | 807 | 774 | ||||||
| Cuisinier et al. (1996) | 1500 | |||||||||
| PB 4a (This work) | 3091|$^{+1220}_{-676}$| | 2632|$^{+220}_{-200}$| | 1230:|$^{+710}_{-620}$| | |$1916^{+1510}_{-1230}$| | 7080c | 2300c | 1061 | |||
| PB 4 (Model) | 2169 | 1853 | 2126 | |||||||
| Cuisinier et al. (1996) | 3970 | |||||||||
Notes. a PB 4 is defined as optically thin nebula following the criteria proposed by Kaler & Jacoby (1989). The PN spectra shows the absence of [O i] and [N i] lines, weak flux of low-excitation lines such as [O ii] and [N ii], and the very weak flux of [N ii] relative to H α (|$\rm {[N II]/H}\alpha \lt 0.1$|).
b Probably unreliable; c The uncertainty is of order 10–30%; d The value after correction for recombination contribution.
Electron temperatures and densities of IC 2501, Hen 2-7, and PB 4 compared with other works.
| Object . | Temperature (K) from CELs . | . | Temperature (K) from ORLs . | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| . | [O iii] . | [Ar iii] . | [N ii] . | [S ii] . | [O ii] . | [O i] . | . | He i . | O ii . | H i Paschen jump . |
| IC 2501 (This work) | 9350|$^{+390}_{-390}$| | 9250|$^{+250}_{-250}$| | 11 200|$^{+300}_{-300}$| | 12 600|$^{+4500}_{-2600}$| | 11 100|$^{+3340}_{-2340}$| | 9140|$^{+570}_{-450}$| | 9275|$^{+2212}_{-2275}$| | 5748|$^{+1431}_{-1282}$| | 10622 | |
| IC 2501 (Model) | 11 260 | 11 270 | 11 110 | 10 440 | 11 230 | 9742 | ||||
| Milingo et al. (2002b) | 9500 | 11 200 | 11 700 | 10 600 | ||||||
| Sharpee et al. (2007) | 9500|$^{+300}_{-200}$| | 9400|$^{+600}_{-500}$| | 10 800|$^{+900}_{-1100}$| | 12 000 | 13 000 | 6900|$^{+300}_{-200}$| | ||||
| Hen 2-7 (This work) | 13 100|$^{+300}_{-300}$| | 10 700|$^{+400}_{-400}$| | 11 600|$^{+200}_{-200}$| | 13 409|$^{+670}_{-670}$| | 9918|$^{+1190}_{-1190}$| | 6950|$^{+500}_{-500}$| | 7017 | |||
| Hen 2-7 (Model) | 12 604 | 12 408 | 12 068 | 11 803 | 12 676 | 9885 | ||||
| Cuisinier et al. (1996) | 11 700 | 11 800 | ||||||||
| PB 4a (This work) | 10 000|$^{+500}_{-500}$| | 14 600|$^{+3000}_{-2800}$| | >19 000b | 3221|$^{+579}_{-965}$| | 7637 | |||||
| 9500|$^{+1000}_{-1000}{}^d$| | − | 17800|$^{+2000}_{-2000}{}^d$| | ||||||||
| PB 4 (Model) | 11 050 | 11 020 | 11 022 | 11 010 | 11 016 | 11 009 | ||||
| Cuisinier et al. (1996) | 9400 | |||||||||
| Object | Density (cm−3) from CELs | Density (cm−3) from ORLs | ||||||||
| [O ii] | [S ii] | [Cl iii] | [Ar iv] | O ii | N ii | H i Paschen decrement | ||||
| IC 2501 (This work) | 7580|$^{+2590}_{-1690}$| | 8830|$^{+2140}_{-1600}$| | 8380|$^{+480}_{-450}$| | 10700|$^{+2800}_{-2200}$| | 3980c | 1270c | 7874 | |||
| IC 2501 (Model) | 8563 | 8401 | 8553 | 8486 | ||||||
| Milingo et al. (2002b) | 4800 | |||||||||
| Sharpee et al. (2007) | 11 000|$^{+9000}_{-4000}$| | 11 000 | 8500|$^{+2100}_{-1600}$| | 8775|$^{+2150}_{-1600}$| | ||||||
| Hen 2-7 (This work) | 1160|$^{+160}_{-140}$| | 881|$^{+66}_{-61}$| | 1010|$^{+130}_{-110}$| | 1600|$^{+370}_{-360}$| | 1584c | 7997b | ||||
| Hen 2-7 (Model) | 808 | 712 | 807 | 774 | ||||||
| Cuisinier et al. (1996) | 1500 | |||||||||
| PB 4a (This work) | 3091|$^{+1220}_{-676}$| | 2632|$^{+220}_{-200}$| | 1230:|$^{+710}_{-620}$| | |$1916^{+1510}_{-1230}$| | 7080c | 2300c | 1061 | |||
| PB 4 (Model) | 2169 | 1853 | 2126 | |||||||
| Cuisinier et al. (1996) | 3970 | |||||||||
| Object . | Temperature (K) from CELs . | . | Temperature (K) from ORLs . | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| . | [O iii] . | [Ar iii] . | [N ii] . | [S ii] . | [O ii] . | [O i] . | . | He i . | O ii . | H i Paschen jump . |
| IC 2501 (This work) | 9350|$^{+390}_{-390}$| | 9250|$^{+250}_{-250}$| | 11 200|$^{+300}_{-300}$| | 12 600|$^{+4500}_{-2600}$| | 11 100|$^{+3340}_{-2340}$| | 9140|$^{+570}_{-450}$| | 9275|$^{+2212}_{-2275}$| | 5748|$^{+1431}_{-1282}$| | 10622 | |
| IC 2501 (Model) | 11 260 | 11 270 | 11 110 | 10 440 | 11 230 | 9742 | ||||
| Milingo et al. (2002b) | 9500 | 11 200 | 11 700 | 10 600 | ||||||
| Sharpee et al. (2007) | 9500|$^{+300}_{-200}$| | 9400|$^{+600}_{-500}$| | 10 800|$^{+900}_{-1100}$| | 12 000 | 13 000 | 6900|$^{+300}_{-200}$| | ||||
| Hen 2-7 (This work) | 13 100|$^{+300}_{-300}$| | 10 700|$^{+400}_{-400}$| | 11 600|$^{+200}_{-200}$| | 13 409|$^{+670}_{-670}$| | 9918|$^{+1190}_{-1190}$| | 6950|$^{+500}_{-500}$| | 7017 | |||
| Hen 2-7 (Model) | 12 604 | 12 408 | 12 068 | 11 803 | 12 676 | 9885 | ||||
| Cuisinier et al. (1996) | 11 700 | 11 800 | ||||||||
| PB 4a (This work) | 10 000|$^{+500}_{-500}$| | 14 600|$^{+3000}_{-2800}$| | >19 000b | 3221|$^{+579}_{-965}$| | 7637 | |||||
| 9500|$^{+1000}_{-1000}{}^d$| | − | 17800|$^{+2000}_{-2000}{}^d$| | ||||||||
| PB 4 (Model) | 11 050 | 11 020 | 11 022 | 11 010 | 11 016 | 11 009 | ||||
| Cuisinier et al. (1996) | 9400 | |||||||||
| Object | Density (cm−3) from CELs | Density (cm−3) from ORLs | ||||||||
| [O ii] | [S ii] | [Cl iii] | [Ar iv] | O ii | N ii | H i Paschen decrement | ||||
| IC 2501 (This work) | 7580|$^{+2590}_{-1690}$| | 8830|$^{+2140}_{-1600}$| | 8380|$^{+480}_{-450}$| | 10700|$^{+2800}_{-2200}$| | 3980c | 1270c | 7874 | |||
| IC 2501 (Model) | 8563 | 8401 | 8553 | 8486 | ||||||
| Milingo et al. (2002b) | 4800 | |||||||||
| Sharpee et al. (2007) | 11 000|$^{+9000}_{-4000}$| | 11 000 | 8500|$^{+2100}_{-1600}$| | 8775|$^{+2150}_{-1600}$| | ||||||
| Hen 2-7 (This work) | 1160|$^{+160}_{-140}$| | 881|$^{+66}_{-61}$| | 1010|$^{+130}_{-110}$| | 1600|$^{+370}_{-360}$| | 1584c | 7997b | ||||
| Hen 2-7 (Model) | 808 | 712 | 807 | 774 | ||||||
| Cuisinier et al. (1996) | 1500 | |||||||||
| PB 4a (This work) | 3091|$^{+1220}_{-676}$| | 2632|$^{+220}_{-200}$| | 1230:|$^{+710}_{-620}$| | |$1916^{+1510}_{-1230}$| | 7080c | 2300c | 1061 | |||
| PB 4 (Model) | 2169 | 1853 | 2126 | |||||||
| Cuisinier et al. (1996) | 3970 | |||||||||
Notes. a PB 4 is defined as optically thin nebula following the criteria proposed by Kaler & Jacoby (1989). The PN spectra shows the absence of [O i] and [N i] lines, weak flux of low-excitation lines such as [O ii] and [N ii], and the very weak flux of [N ii] relative to H α (|$\rm {[N II]/H}\alpha \lt 0.1$|).
b Probably unreliable; c The uncertainty is of order 10–30%; d The value after correction for recombination contribution.
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